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MoldZyme Mold & Mildew
Stain Cleaner & Odor Remover
(formerly ZymoCat)
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Removes Mold & Mildew.
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MoldZyme™ Mold & Mildew Stain Cleaner & Odor Remover
is a non-bacterial, multi-enzymatic product specifically formulated for the Cleaning, Removal and Prevention of Mold & Mildew Stains and Related Odor.

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MoldZyme vs. Bleach


MoldZyme Applications:
  Bathrooms, Bath Houses, Boats, Basements, Kitchens, Ducts, Vents, Walls, Floors, Ceilings, Patios, Decks, Sidewalks, Driveways, Rail Cars, Tanker Trucks, Silos, Manufacturing Facilities, Processing Equipment, and any surface where mold & mildew exists that is not harmed by brief contact with water.

MoldZyme™ Mold & Mildew FAQ Sheet

MoldZyme Mold & Mildew Stain Cleaner Frequently Asked Questions


1.  What is MoldZymeTM Mold & Mildew Stain Cleaner?


MoldZymeTM Mold & Mildew Stain Cleaner is a proprietary enzyme blend scientifically engineered for the cleaning of mold and mildew stains and the removal of the related musty odor. The enzymes, which are proteins functioning as biochemical catalysts, initiate, maintain and/or accelerate specific chemical reactions.


2.  How do I use MoldZymeTM Mold & Mildew Stain Cleaner?


MoldZymeTM Mold & Mildew Stain Cleaner is very easy and safe to use. For existing mold and mildew stains, apply MoldZymeTM to the surface and scrub away mold and mildew stains using a sponge, cloth or brush. For severe stains, apply MoldZymeTM and let stand before scrubbing or reapply one or more times.  MoldZymeTM is not a bleaching agent, so do not expect to see stains immediately disappear just by pouring it onto a surface.


For hard to reach or large areas, MoldZymeTM is more effectively applied with a fogging device. Exterior walls, especially where condensation from room air conditioning unit’s causes mold and mildew stain, can be effectively cleaned using MoldZymeTM and a pressure washer without harming paint or exterior finish.


3.  Is MoldZymeTM Mold & Mildew Stain Cleaner harmful to people, pets, plants, or surroundings?


MoldZymeTM is non-hazardous, non-toxic, and non-flammable. It contains no harsh chemicals, no chlorine, and no ammonia.  MoldZymeTM can safely be used around people, pets, plants, and marine life. Also, the USDA classifies the product (L2 Category) safe for sewage lines and drains.  Exterior surfaces can be effectively cleaned with MoldZymeTM without concern for harming plants, shrubs, flowers, or the environment.


No special clothing is necessary when using MoldZymeTM. Unlike chlorine, ammonia or other harsh chemicals that produce strong, toxic fumes, MoldZymeTM is not harmful to the user and does not require special ventilation. However, due to the potential risk of exposure to mold and mildew, it is a good policy to wear respiratory protection while working in areas where mold is present.


4.  Should I clean the area with a chlorine bleach solution before using MoldZymeTM?


MoldZymeTM is used in place of a chlorine bleach product.


5.  Is MoldZymeTM Mold & Mildew Stain Cleaner environmentally safe?


MoldZymeTM is environmentally safe and biodegradable. The USDA classifies the product (L2 Category) safe for sewage lines and drains. The ingredients of MoldZymeTM are Generally Recognized As Safe (GRAS) according to the Code of Federal Regulations (CFR21), Sections 174-184.   Further, MoldZymeTM is non-toxic and does not contain any hazardous chemicals.


6.  Will MoldZymeTM Mold & Mildew Stain Cleaner cause chemical sensitivities or reactions?


There have been no reported cases where MoldZymeTM has caused any allergic reactions.


7.  Where can MoldZymeTM Mold & Mildew Stain Cleaner be used?


MoldZymeTM can be used on almost any surface that has mold and mildew stains: concrete, bricks, stone, wood, tile, wallpaper, wall vinyl, drapes, carpet, ceiling tiles, patios, decks, walkways, stucco, aluminum siding, vinyl siding, even HVAC coils and filters – any surface that is washable with water.


Caution should be taken when cleaning water-based, painted walls. The water-based paint may be removed or lightened with the use of MoldZyme™.  MoldZyme™ non-corrosive and can be safely used on metal surfaces and metal finishes.


8.  How do I use MoldZyme™ to clean my deck or patio?


MoldZyme™ will safely and effectively remove the mold stains from your deck or patio. Apply it to the surface, brush well, and then rinse dirt and stains away using a hose or pressure washer.


9.  Will MoldZyme™ remove the mold and mildew stains that form on my wood and metal window frames and sills?


MoldZyme™ will safely and effectively remove the mold and mildew stains from window frames and window sills. MoldZyme™ can be used on any surface that isn’t damaged by brief contact with water.


10.  How well does MoldZymeTM Mold & Mildew Stain Cleaner work on grout?


Tile grout is porous (except for epoxy grout). Mold and mildew, if left alone will penetrate the grout, making it impossible to thoroughly clean. Regular washing with cleaners containing acid or chlorine bleach can cause the grout to deteriorate and can bleach the pigmentation of colored grout. Just one cleaning with acid or bleach-based cleaners can ruin tile and polished stone.


If mold and mildew have already penetrated the grout, the best solution is to remove the grout, thoroughly clean the area with MoldZymeTM, and replace the grout. Then use MoldZymeTM as the regular cleaner to keep the grout durable and free from mold and mildew stain. Before replacing grout or tile, it is prudent that the area be cleaned with MoldZymeTM so that the new grout is not being put on top of existing mold and mildew stain that other cleaners may leave behind.


11.  Will MoldZyme™ remove the black mold stains from the caulk between my tub and tiles?


MoldZyme™ will remove mold stains from caulk; however in most cases the black stain you see is not mold or mildew but actually damage to the caulk caused by chlorine-based products. The only solution is to remove the old caulk, replace it with new, mold-proof caulk, and only use MoldZyme™ to clean your tub, shower and tile.


12.  Can I use MoldZymeTM Mold & Mildew Stain Cleaner on carpet or fabrics?


Unlike chlorine-based products that can cause damage, MoldZymeTM is not harmful to carpet, furniture, fabrics or any other surface that is washable with water. We do not recommend using it on sensitive fabrics like: silk, linen, velvet, etc. It is always a good policy to test any cleaning product in an inconspicuous area before using, if you are unsure.


Use MoldZyme™ instead of shampoo, in any commercial carpet cleaning machine. MoldZyme™ removes stains and deodorizes, leaving a clean, fresh-smelling carpet.

Some fabrics are more difficult to clean due to their inherent high surface area; for example, mold may grow in and around all of the fabric’s fibers and this makes it difficult to physically “reach” the mold stain for removal. For these applications it may be best to use a brush or high-powered spray to remove the mold stains. Keep in mind that some stains are impossible to remove no matter what cleaner you use.


13.  Can I use MoldZyme™ to launder moldy clothes?


MoldZyme™ concentrate can be added to the washing machine, in place of detergent, to remove mold and mildew stains and odor from clothing as long as the clothing is machine washable.


Fill empty washing machine tank with cold water.  Add 1 oz. of concentrate to 7-10 gal. of washing machine tank water.  Mix well.  Add clothes.  Run normal washing machine cycle.  Note: Check in hidden area for colorfastness prior to laundryFabrics must be laundered in cold water only.


14.  Will MoldZyme™ remove mold and mildew stains from vinyl boat seats?


Our customers have experienced mixed results at removing the stains from vinyl boat seats. It appears that the chemicals used to treat vinyl seats allow the mold to penetrate the vinyl.  Our customers tell us that MoldZyme™ lightens the stain, but does not completely eliminate the stain.


15.  Can MoldZyme™ be used on wood floors?


Yes, MoldZyme™ is safe to use on wood floors, floor joists, etc as a surface cleaner. For cases where wood materials have supported mold growth for a period of time, mold may have penetrated the wood deeply enough that a surface cleaner may not be a sufficient means of removal; it is recommended to replace the materials completely.


16.  Can MoldZymeTM Mold & Mildew Stain Cleaner be used with pressurized cleaning systems?


Yes, MoldZymeTM is compatible with most commercial cleaning systems: pressurized, mechanical, and manual. However MoldZymeTMcannot be used with steam, thermal foggers or in temperatures in excess of 130 °F (54.5 °C).


17.  Should I mix MoldZymeTM Mold & Mildew Stain Cleaner with other chemicals?


No, do not mix MoldZymeTM with any other chemicals.  Caustic chemicals will destroy the enzymes.


18.  What is the shelf-life of MoldZymeTM?


The shelf-life of MoldZymeTM (Ready-To-Use or Concentrate) is 2 years.


19.  What temperature should I store MoldZymeTM?


We recommend you store MoldZymeTM at room temperature.


20.  Can I use MoldZyme™ on furniture to remove mold stains?


MoldZyme™ can be used on wood, metal and plastics: just spray or wipe it on and then wipe or scrub the stains off.


21.  Can I use MoldZyme™ to clean leather (shoes, handbags, jackets, sofas, car seats, etc.)?


MoldZyme™ does an excellent job at removing molds stains from leather. Simply wet a cloth with MoldZyme™ and begin wiping the mold stains off of your shoes, handbags, jackets, furniture, car seats, etc. After cleaning, apply a leather conditioner.


22.  Does MoldZyme™ have a natural or artificial fragrance added to it?


MoldZyme™ does not have any added fragrances or masking agents, either natural or synthetic. It leaves a fresh, clean smell.


23.  Is MoldZyme™ safe on marble, granite, Corian™ or any of the exotic tiles that builders commonly use?


MoldZyme™ is safe on any surface not harmed by brief contact with water.


24.  How much surface area can I clean with one gallon of MoldZyme™?


One gallon of MoldZyme™ Ready-To-Use product will treat approximately 350 square feet.


25.  My basement has a pungent, musty smell of mold or mildew but I do not see any visible mold. Will MoldZyme™ help with this problem?


MoldZyme™ is an excellent deodorizer of not only mold and mildew odors, but also any organic odor such as urine, skunk, vomit, dead animals, garbage or feces.

Thoroughly spray areas and surfaces directly where odor problems exist.  Treatment with a fogging system is recommended for covering larger areas.  MoldZyme™ does not cover up odors, but actually eliminates them leaving the air smelling fresh and clean.


26.  What is its DOT Hazard Category?


Because MoldZymeTM Mold & Mildew contains no hazardous chemicals, it can be shipped and handled without special HAZMAT procedures or tariffs.

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