What are the ingredients of Powdered Brewery Wash (PBW) ?

Brewing-cleaner chemistry

What Is Powdered Brewery Wash Made Of?

Powdered Brewery Wash has often been described like KFC's secret herbs and spices: everyone knows the broad idea, while the exact recipe stays behind the factory door. That comparison now needs an update. Five Star Chemicals still protects part of the formula, but its current Safety Data Sheet identifies the principal ingredients and their concentration ranges. That gives brewers enough information to explain why PBW works without pretending the entire formulation is known.

The useful answer in 30 seconds

• PBW is a strongly alkaline brewery cleaner formulated to remove dried yeast, wort, protein films, hop residue, grease and other organic soils.
• Its disclosed ingredients include sodium carbonate, sodium percarbonate, tetrasodium EDTA, sodium metasilicate and another chelating salt.
• Each component performs a different job: raising pH, oxidising stains, controlling hard-water minerals, loosening deposits and keeping removed soil from settling back onto the equipment.
• PBW cleans equipment. It does not replace a brewing sanitizer.
• The product must be rinsed away with potable water before cleaned equipment is sanitised or used.

The formula is partly disclosed, not completely secret

The current PBW Safety Data Sheet lists several ingredients by name and gives broad concentration bands. It also states that some chemical identities, exact concentrations or both have been withheld as trade secrets. That distinction matters. Claims that the ingredients are entirely unknown are now inaccurate, while claims that a homebrewer can reproduce PBW exactly are equally shaky.

The disclosed composition explains most of the cleaning system. Sodium carbonate supplies the largest alkaline fraction. Sodium percarbonate adds an oxygen-releasing component. EDTA and a related aminocarboxylate bind troublesome metal ions in the water. Sodium metasilicate adds alkalinity and helps protect surfaces during cleaning. Proprietary components may include additional builders, processing aids or surfactants, but the public documents do not reveal the complete balance.

Disclosed component	Safety Data Sheet range	Primary cleaning role
Sodium carbonate	30 to 60 percent	Raises alkalinity, helps soften organic residue and supports the action of the other cleaning ingredients.
Sodium percarbonate	10 to 30 percent	Releases hydrogen peroxide in water, helping oxidise coloured stains, odours and stubborn organic deposits.
Tetrasodium EDTA	5 to 10 percent	Chelates calcium, magnesium and other metal ions so hard water interferes less with cleaning.
Sodium metasilicate	1 to 3 percent	Provides additional alkalinity, assists soil removal and can help inhibit corrosion on compatible surfaces.
Trisodium aminocarboxylate chelator	0.5 to 1.5 percent	Adds further control of dissolved metal ions and mineral interference.
Proprietary fraction	Exact details withheld	Completes the commercial formula. The public documents do not provide enough information to duplicate it exactly.

Source note: The composition ranges above come from Five Star Chemicals' current PBW Safety Data Sheet. Product directions and compatibility guidance should always be checked against the label on the package you are actually using.

How the chemistry removes brewery grime

Brewing residue is chemically messy. A dried krausen ring can contain yeast cells, denatured proteins, carbohydrates, hop compounds, minerals and lipids. A single cleaning ingredient rarely handles that mixture well. PBW works because several mechanisms operate at the same time.

1. Alkalinity attacks organic soil

Main contributors: sodium carbonate and sodium metasilicate

When PBW dissolves, it produces a high-pH solution. Alkalinity swells and loosens protein-rich films, helps break some chemical bonds in organic deposits and improves the removal of fatty material. It also converts some fats into more water-dispersible forms through alkaline hydrolysis.

This is why a warm PBW soak can soften a hard krausen ring or cooked wort film that plain water leaves behind. The cleaner is changing the soil chemically, not merely making it wet.

2. Oxygen chemistry breaks down stains

Main contributor: sodium percarbonate

Sodium percarbonate is a solid compound made from sodium carbonate and hydrogen peroxide. In water it releases hydrogen peroxide, which then participates in oxidation reactions. These reactions can disrupt coloured organic molecules and help loosen stale-smelling or deeply stained residue.

The bubbles are visually satisfying, but bubbling alone is not the measure of cleaning power. Temperature, concentration, water chemistry, soil load and contact time all affect the result.

3. Chelators disarm hard water

Main contributors: tetrasodium EDTA and a related chelating salt

Calcium and magnesium ions can react with cleaning ingredients, reduce their efficiency and leave mineral residue behind. Chelators wrap around these ions and keep them dissolved. That allows the alkaline and oxygen-releasing parts of the formula to spend more of their effort on the brewing soil.

Chelation also helps prevent removed material from redepositing as the solution cools or becomes loaded with grime.

4. Wetting and dispersion carry the dirt away

Likely supported by proprietary components

A cleaner must reach the deposit, penetrate it and keep the detached material suspended until rinsing. Surfactants and dispersing agents lower interfacial tension and help water spread over greasy or resinous films. Five Star describes PBW as a formulated alkaline cleaner, but the complete surfactant package is not publicly itemised.

This is one reason a mixture of two household powders may clean effectively while still behaving differently from commercial PBW.

Why heat and contact time make such a difference

Chemical reactions generally proceed faster as temperature rises, and warm water also lowers the viscosity of sticky wort and hop residues. Heat helps the solution penetrate deposits, while time allows alkalinity, oxidation and chelation to work beyond the surface layer.

The manufacturer's current directions call for pre-rinsing, using a concentration appropriate to the soil load, circulating warm solution for at least 30 minutes in a cleaning system, or soaking heavily soiled equipment hot for several hours or cold overnight. Homebrew equipment often needs less aggressive treatment because the soil layer is thinner, especially when it is rinsed immediately after use.

1. Remove loose material first. Rinse out yeast, hop debris, trub and pooled beer before adding cleaner. Every gram removed mechanically is one less gram the solution must process.
2. Use the label concentration. More powder does not automatically produce a better result. Excessively strong cleaner wastes product, increases rinsing demand and can raise the risk of residue or surface damage.
3. Choose a safe temperature. Warm solution usually cleans faster, but the vessel, seals, tubing and plastic parts must tolerate the temperature.
4. Wet every surface. Fill above the krausen line, circulate through valves and dip tubes, and disassemble fittings where hidden soil can remain.
5. Give the chemistry time. Light films may release quickly. Dried or carbonised deposits need a longer soak.
6. Rinse thoroughly. Use potable water and continue until no powder, slickness, foam or visible film remains.
7. Inspect before sanitising. A sanitizer should be applied only after the equipment is visibly and physically clean.

PBW cleans, but it does not replace sanitizer

This point deserves blunt wording because older brewing advice often blurs the line. PBW is sold and documented as a cleaner. Its job is to remove soil. A brewing sanitizer is used afterward to reduce the microbial population on the cleaned surface before it contacts cooled wort, yeast or finished beer.

Organic residue can shelter microorganisms and consume sanitizer. Cleaning therefore makes sanitation more reliable, but the cleaning step itself should not be treated as a validated no-rinse sanitizing process.

Cleaning removes the shield

PBW removes krausen, yeast films, hop oils, sugars and other material that can protect microbes or prevent sanitizer from reaching the equipment surface.

Sanitising controls what remains

After rinsing the cleaner away, use a suitable brewing sanitizer according to its own label. The site's homebrew cleaning and sanitisation guide explains the wider process.

What PBW is especially good at removing

PBW earns its place in a brewery because it handles the deposits that make weak household cleaners struggle. It is particularly useful for:

• Dried krausen: yeast, protein and hop material bonded into a stubborn ring above the beer line.
• Wort and malt residue: sticky carbohydrates and heat-altered proteins left in kettles, spoons, tubing and fermenters.
• Hop oils and resinous films: hydrophobic compounds that can cling to plastic, stainless steel and draft components.
• Yeast sediment: compacted cells and organic material inside bottles, fermenters and keg parts.
• Cooked-on organic deposits: darkened residue on kettles and heating surfaces, although severely burnt material may still require repeated treatment or careful mechanical assistance.
• Bottle labels and some adhesives: soaking can loosen paper and water-sensitive glues, as explained in the guide to removing labels from beer bottles.

Beerstone needs a separate judgement. PBW can remove the organic film surrounding light mineral deposits, but established beerstone contains calcium oxalate and may require an acid-cleaning stage. Alkaline and acid cleaners solve different chemical problems and should be used separately, never mixed together.

Material compatibility and the limits of “safe”

Five Star lists PBW for stainless steel, rubber and many plastics, while its current product guidance says to avoid aluminium. Compatibility still depends on concentration, temperature, contact time and the condition of the surface. A chemical described as suitable for a material can still cause trouble when mixed too strongly, left far too long or trapped in crevices.

Material	Practical guidance
Stainless steel	Generally well suited to PBW. Follow the label, rinse thoroughly and avoid allowing deposits from dried cleaner to remain on the surface.
Glass	Useful for bottles and carboys. Inspect glass for chips or cracks before filling with hot solution.
Brewing plastics	Soaking reduces the need for abrasive scrubbing, which is valuable because scratches can retain soil. Respect the plastic's temperature limit.
Rubber and silicone parts	Usually suitable for normal cleaning periods. Remove seals where possible so trapped soil and cleaner can be rinsed away.
Aluminium	Avoid according to current Five Star guidance. Strong alkaline cleaners can attack aluminium surfaces.
Copper and brass	Use cautiously and follow manufacturer directions. Colour changes can occur, and prolonged alkaline exposure is unnecessary.

Can you make a substitute at home?

A blend based on sodium percarbonate and sodium metasilicate can imitate two important parts of PBW's chemistry. That is the basis of the site's DIY PBW-style cleaner recipe. Such a blend can be effective for routine bottle, fermenter and kettle cleaning.

The weak point is the word “same”. A two-ingredient home mixture does not recreate PBW's disclosed chelators, proprietary fraction, granulation, buffering balance or manufacturing controls. It may clean well, especially in soft water, while behaving differently in hard water or on heavy protein and hop-oil deposits.

For brewers choosing between the two, the decision is practical:

• Use genuine PBW when cleaning expensive equipment, recirculating through a keg or draft system, dealing with hard water, or attacking neglected deposits.
• Consider a DIY oxygen cleaner for lower-cost routine soaking when you understand the ingredients, surface limits and rinsing requirements.
• Avoid fragranced laundry products because perfumes, dyes and additives have no place on beer-contact equipment.

Safety: “non-caustic” does not mean harmless

PBW is marketed as a user-friendly alternative to caustic soda cleaners, but it is still a strongly alkaline chemical mixture. The Safety Data Sheet classifies it as harmful if swallowed and capable of causing skin and serious eye irritation.

• Wear suitable gloves and eye protection when measuring or mixing the powder.
• Avoid creating or inhaling dust.
• Add the powder carefully to water and keep your face away from the container.
• Never mix PBW with acids, chlorine cleaners or other chemicals.
• Keep the dry powder tightly sealed in a cool, dry place.
• Rinse food-contact and beer-contact equipment thoroughly with potable water.
• Keep the product away from children and pets.

Frequently asked questions

Is sodium percarbonate the main ingredient in PBW?

No. The current Safety Data Sheet lists sodium carbonate at 30 to 60 percent and sodium percarbonate at 10 to 30 percent. Sodium percarbonate is important, but it is one part of a broader alkaline and chelating system.

Does the oxygen released by PBW sanitize equipment?

Do not rely on it as your sanitizing step. PBW is a cleaner and must be rinsed away. Sanitise the clean equipment afterward with a brewing sanitizer used according to its label.

Why does PBW work better than plain sodium percarbonate?

PBW combines oxygen chemistry with alkalinity, hard-water control and proprietary cleaning aids. Plain sodium percarbonate lacks the same complete balance, particularly the disclosed chelators that bind calcium and magnesium.

Can PBW remove every form of beerstone?

It can help expose or remove light buildup by stripping away organic material. Heavy calcium oxalate deposits may require a compatible acid cleaner after the alkaline-cleaning stage.

Can PBW be left in a keg overnight?

Cold overnight soaking is included in the manufacturer's general directions for heavy soil, but Five Star also warns that leaving solution in contact with keg seals beyond roughly 8 to 12 hours may leave scale. Follow the current label, rinse promptly and avoid treating an overnight soak as an indefinite storage method.

The real reason PBW works

PBW is effective because it is a cleaning system rather than a single miracle powder. Alkalinity weakens organic deposits. Peroxide chemistry oxidises stains. Chelators control the minerals that interfere with cleaning. Proprietary wetting and dispersing agents help the solution reach the soil and carry it away.

The formula still contains protected details, but enough is publicly disclosed to retire the idea that nobody knows what is inside. Brewers now have a better answer: the broad chemistry is visible, the precise commercial balance remains Five Star's property, and the practical method remains unchanged. Rinse first, mix correctly, allow enough time, rinse thoroughly, then sanitise.