10 Best Roof Cleaners 2025 in the United States

Rust-Oleum’s Elastomeric Roof Coating is a liquid roof cleaner and protective coating designed for outdoor use on various roofing materials. It comes in a large 4.75-gallon pail and covers about 35 square feet per gallon, making it suitable for medium-sized roof areas. This product is applied by spray, which can help with even coverage but may require appropriate equipment and some experience for best results.

One of its standout features is high reflectivity—84% initially and 74% after weathering—meaning it helps reflect sunlight and can reduce roof heat, potentially lowering cooling costs. The coating becomes rain resistant within 6 hours of application, which is convenient if weather is unpredictable. It also offers waterproof and weatherproof protection to extend roof life. The matte white finish brightens the roof without a shiny look.

The coverage is limited compared to some other products, so you might need more than one pail for larger roofs. The 6-hour cure time before rain exposure is relatively fast but still requires some dry weather planning. This roof coating is a strong choice for homeowners looking to improve roof durability and energy efficiency with a reflective, waterproof layer, especially on RVs or small to medium residential roofs.

The Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover is a concentrated outdoor cleaner designed to tackle stains caused by moss, mold, mildew, and algae. It stands out for its ease of use—simply dilute with water, apply with a garden sprayer, and let nature do the work without needing to scrub or rinse. This could be a huge time-saver for homeowners dealing with stubborn stains on various hard, sealed surfaces, including roofs, patios, and driveways.

Its coverage area ranges from 375 to 1,125 square feet, making it suitable for both small and larger cleaning projects. One notable feature is its long-lasting effectiveness; stains might take several weeks to months to disappear completely, but the treated surfaces can remain clean for up to a year or longer, which is impressive. In terms of safety, the cleaner is bleach-free and non-acidic, which is a plus for those concerned about harsh chemicals.

However, it requires careful application to avoid runoff into water sources and necessitates flushing plants with water before and after use. This could be a drawback for users in areas with abundant vegetation or near bodies of water. Additionally, the cleaner’s effectiveness depends on environmental conditions, meaning results may vary based on local weather patterns. Users may need to be patient, especially with long-established stains, as they may take 6-12 months to fully disappear. This product is best suited for individuals looking for a hassle-free cleaning solution for outdoor surfaces, provided they can manage the application precautions and are willing to wait for results.

Wet & Forget Moss, Mold, Mildew, & Algae Stain Remover is a liquid concentrate designed to clean outdoor surfaces including roofs, siding, decks, and concrete. It works without scrubbing, rinsing, or pressure washing—simply mix with water, spray on a dry surface, and let nature handle the rest. This makes it very user-friendly, especially for those who want an easy application. The product is fragrance-free and safe for a variety of materials.

It requires specific weather conditions for best results—apply on cool, dry days without rain expected soon to avoid washing away the solution prematurely. Stain removal starts within 1-2 weeks for lighter moss or algae but can take several months for stubborn or black stains; some deep-set stains may need up to a year to disappear fully. The product can keep surfaces cleaner for a year or more, reducing maintenance frequency. It’s a good choice if you prefer a gentle, hands-off approach and don't need instant results.

Since the formula works gradually with rain and wind, its effectiveness depends on local weather patterns. This product is well-suited for homeowners looking for a low-effort, multi-surface outdoor cleaner that’s mild yet reliable over time.