10 Best Natural Mold Killers 2025 in the United States

Concrobium 25326CAL Mold Control Spray is designed to eliminate mold, mildew, and musty odors while preventing them from coming back. It uses an EPA-registered formula that works by crushing mold spores as it dries, which means you don’t need to scrub or rinse after applying. This makes it very easy to use—just spray on the affected area and let it dry. The product is odorless, which is a plus for those sensitive to strong smells often found in chemical cleaners. It is safe for a variety of surfaces, thanks to its bleach-free and gentle formula, so it can be used on walls, wood, fabrics, and more. It covers roughly 80 to 110 square feet per 32-ounce bottle, which is fairly standard for this type of spray. Environmentally, it’s biodegradable, which reduces its impact compared to harsher chemical options.

Because the formula is gentle and natural, it might take longer to see full results compared to stronger bleach-based products. Also, while it prevents mold regrowth, it doesn’t physically remove thick mold patches, so heavy infestations might require additional cleaning first. This spray is ideal for people looking for an easy, safe, and eco-friendly way to control mold in their homes without dealing with harsh chemicals or strong odors.

RMR-86 Instant Mold and Mildew Stain Remover Spray is designed to tackle stubborn mold and mildew stains effectively. One of its significant strengths is the fast-acting formula that eliminates stains without the need for scrubbing, making it user-friendly and time-efficient. The spray can be applied on a variety of surfaces, including decks, wood, vinyl siding, drywall, concrete floors, brick walls, and kitchen surfaces, demonstrating its versatility. This wide surface compatibility is beneficial for users dealing with mold and mildew in different areas of their home or property.

The product boasts a 'Fresh' scent, which might be pleasant compared to some chemical cleaners that have a harsher odor. However, it's important to note that proper ventilation and personal protective equipment (PPE) should be used during application, indicating that the product might have strong fumes or chemicals that could be potentially harmful if inhaled or if it comes into contact with skin. This aspect may not align with those looking for a more environmentally friendly option.

Additionally, while it promises instant results, users should be cautious about its environmental impact and the nature of its ingredients, which are not specified as being natural or eco-friendly. RMR-86 is effective and convenient for removing mold and mildew stains, but users should weigh its fast-acting capability and ease of use against safety precautions and potential environmental concerns.

Concrobium 27400CAL Mold Control Aerosol is a practical option for eliminating mold, mildew, and musty odors in your home. Its EPA-registered formula works by crushing mold spores as it dries, which helps prevent future growth without the need for scrubbing or rinsing. This makes it very easy to use—just spray the affected area and let it dry. The product is odorless and contains no bleach or harsh chemicals, making it safe for use on various surfaces like wood, drywall, and fabric without causing damage or leaving a strong scent behind.

One of its main advantages is its broad surface compatibility and gentle, environmentally friendlier approach compared to harsher chemical alternatives. It covers about 100-150 square feet per 14 oz. can, which is fairly efficient for small to medium-sized mold problems. However, it’s important to note that this mold control spray does not remove stains, so if your mold has left discoloration, additional cleaning might be necessary. Also, while it is effective at controlling mold growth, it may require repeated applications for severe infestations.

This product is suitable for homeowners or renters looking for a straightforward, non-toxic way to manage mold issues on indoor surfaces without strong odors or heavy chemicals.