The D&D Guide to Brewery Cleaning: Assemble Your Sanitation Party

By Frances Tietje-Wang

Roll for Initiative: Assemble Your Sanitation Party

The brew day may be finished, but the quest isn’t, because krausen still clings to the fermenter wall, yeast has worked its way into fittings, hop residue refuses to leave quietly, and mineral deposits are slowly establishing themselves in places nobody particularly wants to inspect.
Bend an old gasket, and there are all sorts of surprises!

It is time! Assemble the party!

Brewery cleaning would be considerably easier if every encounter involved the same monster, but that just isn’t organic storytelling. Instead, equipment collects proteinaceous and other organic residues, yeast and hop material, mineral deposits and beerstone, and, when cleaning falls short, attached microbial communities and biofilms. Asking one cleaning chemistry to handle all of them is a little like sending the Barbarian ahead to pick the lock, decipher the runes, heal the Cleric, and negotiate with the dragon. Sure, he has a strength of 18 with advantage, but an intelligence of 4, with disadvantage.

That being said, even the right party needs decent combat conditions. Cleaning depends on the interaction of Time, Action, Concentration, and Temperature (TACT). Change one, and the entire cleaning cycle can change.

Successful brewery cleaning, then, isn’t about finding the strongest chemical in the equipment room (sorry, Barbs), but about knowing what you're fighting, understanding what each chemistry brings to the party, and giving it the conditions it needs to roll for damage.

Roll a Perception Check: Know What You're Fighting

Before anyone burns a spell slot, figure out what’s actually in the room. Brewery equipment rarely collects one tidy type of soil, so choosing cleaning chemistry without identifying the problem first is a good way to waste both chemicals and time.

Organic soils make up much of the usual post-production mess. Proteins, yeast, wort and carbohydrate residues, hop-derived material, and sometimes lipids can accumulate on equipment surfaces. More importantly, they don't politely organize themselves into separate layers or attack one at a time. A dried krausen ring, an obstinate mongrel, is a mixed deposit whose components may respond differently to cleaning chemistry.

Then there are inorganic soils. Calcium-containing deposits and scale originating from process or cleaning water present different chemistry than fermentation residue. Beerstone is another stubborn example, with calcium oxalate as a major inorganic component. These deposits may require an acid-cleaning strategy rather than simply another round of punches against the organics.

Biofilms are a different lineage of monster. Microorganisms can attach to surfaces and become embedded within a matrix of extracellular polymeric substances (EPS). Recognizing biofilms, which can behave differently from free-floating microbes and show increased resistance to disinfectants, is crucial for effective sanitation.

Brewery Monster Manual:

Monster: Gelatinous Cube

Brewery Encounter: Sticky krausen and fermentation residue

Monster: Mimic

Brewery Encounter: Biofilm on an apparently clean surface

Monster: Rust Monster

Brewery Encounter: Corrosion and equipment deterioration

Monster: Ochre Jelly

Brewery Encounter: Heavy yeast and trub deposits

Meet the Barbarian: Alkaline Chemistry Brings the Muscle

The Barbarian isn’t known for subtlety. When the encounter involves heavy organic soil, alkaline chemistry supplies much of the muscle needed. Biceps and delts, of the cleaning variety.

At elevated pH, alkaline cleaners help swell and solubilize proteinaceous deposits and promote the hydrolysis of susceptible organic material. They can also saponify fatty soils, although fats are usually a smaller part of the brewery cleaning problem than proteins, yeast, wort, and other fermentation residues unless someone got creative with a turkey meant for the tavern cook. The important point is that brewery soil is rarely one thing, and alkaline chemistry acts with prejudice against the mixed organic deposits left behind by production.
 
PBW provides a familiar example. An alkaline, non-caustic cleaner formulated for difficult organic soils, proteins, and stains, it is useful for everything from fermenters and kegs to equipment that cannot easily be reached with a brush.

The Barbarian does have rules, though. Cleaning performance still depends on using the correct concentration, temperature, and contact time for the application. He needs his protein powder, bro. Circulation and soaking are not interchangeable, and soil load can affect how the cleaner is used. Once the encounter is finished, the equipment also needs to be properly rinsed before moving on to sanitation.

Dumping in extra cleaner because a tank looks particularly nasty is not the equivalent of rolling with advantage. More chemical does not automatically mean more cleaning.
The Barbarian can rage against the unclean, but is still limited by his character sheet (Safety Data Sheet).

Meet the Rogue: Surfactants Work the Angles

The Barbarian takes on the obvious threat, like the spider throwing knives. The Rogue specializes in getting where brute force alone isn’t enough, because he knows the spider isn’t the one throwing knives.

The Rogue (surfactants) work at the boundaries between water, soil, and equipment surfaces. Their molecular structure reduces surface and interfacial tension, helping an aqueous cleaning solution wet surfaces and interact more effectively with deposits that water alone may struggle to contact. In practical terms, better wetting gives the rest of the cleaning chemistry more opportunity to do its job.

Surfactants can also help emulsify hydrophobic material, disperse loosened soil, and keep removed material suspended in the cleaning solution rather than allowing it to settle or redeposit elsewhere. This is especially useful with hop-derived residues and other hydrophobic films, but the benefits extend to ordinary equipment geometry as well. Roll with advantage for vessel walls, gasket interfaces, valve components, and irregular surfaces, which all depend on adequate cleaner-to-surface contact.

Meet the Wizard: Oxidizers Change the Encounter

When brute force and clever positioning aren’t enough, the Wizard can change the chemistry of the encounter itself.

Oxidizers work by reacting with susceptible organic molecules, altering their chemical structure and helping other components of a cleaning formulation loosen and remove the resulting soil. Depending on the formulation and deposit, that can make oxidative chemistry useful against complex organic residues, staining or color bodies, fermentation deposits, and organic material associated with microbial buildup. Rather than simply adding more alkalinity to the fight, the Wizard brings an entirely different mechanism of action.

This is also where the analogy needs an important limitation. Oxidizers are powerful, but they are not a Fireball spell for biofilms, even though that would make being a brewer wicked awesome.

A mature biofilm is a heterogeneous microbial community embedded within an extracellular polymeric substance (EPS) matrix. Oxidative chemistry can react with susceptible components of that matrix, but that does not mean one treatment automatically destroys the entire structure or eliminates every organism protected within it. The wizard can rock it out, but still depends on removing the soils and matrix supporting the community, providing adequate mechanical action, and following cleaning with appropriate sanitation.

In other words, oxidative chemistry can be one valuable member of a larger cleaning formulation or program. It shouldn't be expected to solo every encounter just because the spell sounds impressive.

Basically, the Wizard has some epic spells, but limited spell slots, so use wisely.

Meet the Artificer: Chelators Manipulate the Terrain

The Artificer isn’t necessarily swinging a sword. Their strength is understanding the environment and modifying it so the rest of the party can work more effectively. In brewery cleaning, that makes chelators and sequestrants a natural fit.

Like anything in brewing, water isn’t just along for the ride. It is part of the cleaning system. Calcium and magnesium contribute to water hardness, while iron and other dissolved metals can also influence cleaning conditions. Left unmanaged, these ions may interact (problematic henchmen, of course) with cleaning chemistry, contribute to precipitation, or become part of deposits on equipment surfaces.

Chelating and sequestering agents help manage that problem by binding or otherwise keeping troublesome metal ions in solution. Depending on the formulation, this can reduce
hardness-related interference, limit precipitation and redeposition, and allow other components of the cleaner to work more effectively. This is particularly valuable when a brewery’s water brings its own challenges.

The Artificer does have limits because chelation helps manage metal ions during cleaning, but it shouldn’t replace removing established inorganic deposits. Once beerstone or mineral scale has accumulated, an appropriate acid-cleaning step may be needed to dissolve and remove those deposits.

Think of it as the difference between preventing difficult terrain and discovering someone has already built a stone wall when opening the easiest door.

Your cleaning water isn’t just a way to deliver the party into battle, but part of the terrain.

Meet the Cleric: Acid-Anionic Sanitizers Protect the Party

The Cleric has been traveling with the party all along. Their abilities simply aren’t designed for breaking down the villainous krausen ring.

That distinction gets at a fundamental point of brewery sanitation: cleaning and sanitizing are not interchangeable.

Cleaning removes soils and residues from equipment surfaces.

Sanitizing comes afterward, reducing microorganisms on an adequately cleaned surface under the sanitizer's specified conditions.

Skipping the cleaning step and heading straight for sanitizer is essentially asking the Cleric to heal someone while the monster is still hitting them. Not cool.

Star San provides a practical example. This acid-based, high-foaming sanitizer is designed for use on previously cleaned surfaces. Its foam helps the solution stay in contact with equipment surfaces and reach cracks and crevices, which is useful for fittings, small parts, and other brewery equipment where complete coverage matters. Used at the correct concentration and according to labeled contact conditions, Star San can be drained without a potable-water rinse.

That foam sometimes makes brewers nervous, but it isn’t evidence that the sanitizer was mixed too strongly. Determine concentration by proper dilution, not by how dramatic the foam looks. We didn’t invite the Bard.

Star San doesn't leave behind a persistent antimicrobial force field protecting the equipment indefinitely. Once sanitation is complete, good handling still matters.

You wouldn’t ask the Cleric to smash through the dungeon door simply because they’re in the party. Follow the procedure, and then let the Cleric do their job.

Meet the Paladin: Peracetic Acid Takes a Different Oath

The Paladin isn’t a more powerful version of the Cleric. It’s a different character build, with abilities better suited to different encounters, so let's dive into application.

When comparing peracetic acid (PAA) with acid-anionic sanitizers, one isn't automatically “better” just because the chemistry is different. PAA is an oxidizing antimicrobial used broadly in food and beverage sanitation. Exactly what it can claim to control, however, depends on the individual formulation, concentration, contact time, and registered label, NOT PAA chemistry in the abstract. In other words, read the character sheet before announcing that your Paladin has a new ability. Mounted Combatant now? Really? In a brewery?

Five Star’s Saniclean PAA Pro provides the practical brewery example. It is an EPA-registered, acid-based sanitizer formulated with light-cleaning action. Its low-foaming profile makes it particularly suited to CIP and recirculation, with applications including fermenters, brite tanks, kegs, hoses, and packaging lines. Five Star’s published product information lists efficacy against bacteria, yeasts, and molds. Claims beyond that (including sporicidal activity) should come from the applicable EPA label rather than assumption.

The choice between this Paladin and the acid-anionic Cleric, then, comes down to the application because foam, equipment, cleaning system, and operating conditions all matter when selecting sanitation chemistry.

Nobody argues that the Paladin is objectively better than the Cleric… at least, nobody who wants the D&D session to remain pleasant. They are different builds. Different applications. Same party.

The Dungeon Master: CIP Controls the Encounter

The chemistry is the party, but clean-in-place (CIP) determines the conditions of the encounter. Even a perfectly assembled group can struggle when the Dungeon Master (DM) stacks the room against them.

This brings us back to TACT: Time, Action, Concentration, and Temperature. Was the cleaner given enough contact time to work, or did someone try to speed-run the dungeon? Action matters just as much. In piping, flow dynamics come into play; in vessels, effective spray coverage and impingement do. Some equipment may still require disassembly or manual action when CIP cannot adequately reach the soil. But that’s Kyle’s job, right?

Concentration also needs more than a confident pour from the chemical drum. Depending on the chemistry and system, titration, conductivity, or another appropriate method can verify that the working solution was prepared and remains at the intended strength.

Then there is temperature. Weird to say, but hotter is not automatically better. Cleaning chemistry has an appropriate operating range (check the character sheet or SDS), and excessive temperature can waste energy, affect materials, or change how certain soils behave.

Every dungeon has hazards: dead legs become hidden passages, poor spray coverage creates inaccessible rooms and dead ends, while a blocked spray device is a trap waiting to be discovered. Sorry Kyle. Incorrect concentration means someone ignored their character sheet, while inadequate mechanical action turns the whole encounter into difficult terrain.

Ultimately, chemistry won’t solve a mechanical problem. Even the best party struggles when the DM makes the encounter impossible. You Rick Rolled us, Matt.

Don't Split the Party: Common Brewery Cleaning Campaign Mistakes

There is a reason every D&D player eventually learns not to split the party. Brewery cleaning programs benefit from the same advice, and problems tend to start when one part of the system is expected to compensate for everything else.
Common ways to get your sanitation party into trouble include:

• Asking the Cleric to break down the door: Using sanitizer to compensate for inadequate cleaning.
• Making the Barbarian solo the dungeon: Assuming alkaline chemistry handles every type of soil.
• Leaving the Artificer at the tavern: Ignoring cleaning-water chemistry and hardness.
• Ignoring difficult terrain: Using the right chemistry with inadequate flow, mechanical action, or spray coverage.
• Ignoring the character sheet: Operating outside specified concentration, temperature, or contact-time parameters.
• Trying to overlevel: Assuming more chemical automatically means better cleaning.
• Failing the Perception check: Neglecting valves, gaskets, hoses, spray devices, and other difficult-to-inspect surfaces.
• Declaring victory too early: Treating a completed CIP cycle as proof that equipment is actually clean.

The larger lesson is that cleaning chemistry never operates alone. Equipment design, water, process control, maintenance, sanitation, inspection, and verification all affect the outcome.

Don’t split the party. Build a cleaning program that works as one.

The Character Sheet: Document Your Cleaning Program

Every adventurer has a character sheet. Your cleaning program should have one, too. Otherwise, “we always clean it this way” can quickly become brewery shorthand for a process nobody can completely describe.

Depending on the operation, document:

• Equipment: Vessel, line, or system being cleaned
• Cleaning target: Soil or process residue being addressed
• Chemistry: Cleaner and sanitizer used
• Concentration: Target and actual working concentration
• Water: Relevant water conditions or treatment
• Temperature: Target and actual temperature
• Time: Cycle or contact time
• Action: Flow, spray coverage, or other mechanical action
• Rinse: Defined rinse criteria or endpoint
• Inspection: Visual or other inspection findings
• Verification: Results of the selected verification method
• Maintenance: Damaged gaskets, hoses, fittings, or other findings requiring attention

Quality also distinguishes between monitoring and verification.

Monitoring asks whether the cleaning process ran according to its established parameters. Verification asks whether that process actually achieved the expected result.

Depending on the application, verification may include visual inspection, ATP or other rapid hygiene methods, microbiological testing, rinse evaluation, or periodic equipment disassembly and inspection.

No single method is a universal saving throw; choose the tool that answers the question you are actually asking, and take action accordingly.

A useful character sheet should ultimately tell you three things: This was the process. These were the actual conditions. And this is the evidence that it worked.

The Campaign Continues

Brewery sanitation has no final boss. Tomorrow, someone will put wort back into that freshly cleaned fermenter, and the whole campaign starts again.

Successful cleaning is about understanding the encounter and knowing which abilities are needed. The Barbarian brings alkaline muscle, while the Rogue improves wetting and dispersion. The Wizard contributes oxidative chemistry when the formulation calls for it, but the Artificer manages troublesome ions. Once the equipment is clean, the Cleric or Paladin can step in with the sanitizer appropriate to the application. Meanwhile, CIP oversees all as the DM, determining whether the party gets the time, action, concentration, and temperature needed to succeed.

The brewer’s adventuring code is fairly simple:

1. Identify the soil and microbial risk.
2. Select cleaning chemistry with the appropriate functions.
3. Control time, action, concentration, and temperature.
4. Verify that cleaning achieved the expected result.
5. Sanitize according to the product label and application.

Document it and inspect the equipment for effectiveness. Ready to roll for initiative again?

The party stays assembled because the quest never really ends. After all, the brewery sanitation campaign only ends when the brewhouse does its last brew, and we all hope that is a long way off in a future that even the DM can’t control.

Frances Tietje-Wang (they/them) is a brewing chemist, researcher, writer, stand-up comic, speaker, and educator who has spent their career making beverage science a little more approachable and considerably less boring.

With a background in biochemistry, microbiology, food safety, quality assurance, and sensory science, Frances works with breweries and beverage producers through Fermly and writes and teaches on topics ranging from cleaning and sanitation to fermentation, stability, and odd historical connections. 

Their work has appeared across the brewing industry, and they regularly speak and teach for professional brewing organizations, including the MBAA, ASBC, and the BA. When they aren’t in a lab or writing about microbes, Frances can be found running obnoxiously long distances (for fun!), teaching yoga, and exploring the world through multiple forms of art.