10 Best Chemical Roof Cleaning Solutions 2025 in the United States

The 30 SECONDS Pro Mold and Mildew Stain Remover is designed to tackle mold and mildew stains both indoors and outdoors without scrubbing, making it user-friendly and ideal for those seeking to avoid tough physical work. Its formula is twice as strong as the original 30 SECONDS Outdoor Cleaner, promising faster and brighter results. This product works on various surfaces such as wood, concrete, vinyl siding, and tile, making it versatile enough for roof cleaning and other household mold issues. The fresh scent is a nice touch since some chemical cleaners can have overpowering odors.

It comes ready to use in a large refill bottle, which makes application straightforward and convenient, although the product dimensions and weight suggest it may be somewhat bulky to handle. Since the effectiveness duration or how long the mold stays away after application isn't specified, repeated treatments might be necessary in damp conditions.

This cleaner is well suited for someone seeking a powerful, scrub-free solution for mold and mildew with easy application, but it is recommended to test a small area first on roofing materials before full use.

Southern Drawl - Southeast Softwash is a liquid roof and siding cleaner designed for use with pressure washers and soft wash systems. Its active ingredients include organic surfactants that help the cleaning solution cling to surfaces longer, improving the removal of organic materials like mold, moss, and mildew. It is intended to be mixed with bleach or sodium percarbonate, enhancing its effectiveness through these powerful agents. This makes the solution quite strong against tough grime but requires careful handling, especially on more delicate roofing materials. The product is safe for common roofing types such as metal, slate, and asphalt shingles, but caution is advised to avoid potential damage due to bleach mixtures. The citrus-lemon scent reduces harsh chemical odors often associated with roof cleaners.

From an environmental perspective, the organic surfactants are better than harsh chemicals alone, but the use of bleach-based additives means there is still some environmental impact to consider, particularly regarding runoff. Application is straightforward for those familiar with pressure washing: it mixes easily and can be sprayed on, then rinsed off after dwelling to let the chemicals work. The effectiveness duration is linked mostly to the initial cleaning power rather than long-lasting prevention, so repeat cleaning might be necessary over time.

This product is suitable for homeowners or professionals looking for a strong, versatile cleaner for vinyl siding and various roof types, especially when paired with a soft wash or pressure washing system. People seeking a milder or purely eco-friendly solution might want to consider alternatives, but Southern Drawl provides a good balance of power and ease of use for tough exterior cleaning jobs.

Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover is a liquid concentrate designed to clean outdoor surfaces like roofs, wood, concrete, and siding without scrubbing or rinsing. Its active formula gently removes stains caused by moss, mold, mildew, and algae by simply spraying the diluted solution and letting rain and wind do the work. This makes it very easy to use, especially if you want to avoid the hassle of pressure washing or manual scrubbing. The product is fragrance-free and safe for various roofing materials, which reduces the risk of damage or discoloration. It’s also environmentally friendly since it relies on natural weathering rather than harsh chemicals or rinsing runoff.

One trade-off is that it takes time to work—light stains clear within 1-2 weeks, but tougher or older stains may require several months or even up to a year to fully disappear. This slow effect is ideal if you prefer a low-effort, gradual clean but might be frustrating if you need quick results. The product is odorless, which is a plus for those sensitive to strong smells. You should apply it on a cool, dry day with no rain expected for a few hours to ensure the best performance.

Wet & Forget is well-suited for homeowners and property managers looking for a gentle, easy-to-apply roof cleaner that lasts up to a year, especially if patience for gradual stain removal is not an issue.