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.

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover is a versatile multi-surface cleaner that attaches to your garden hose with a new and improved nozzle for ease of use. The jet tip can spray up to 30 feet, making it ideal for reaching high areas like roofs, while the fan tip allows quick application on larger surfaces such as driveways and decks. One significant advantage is that it doesn't require rinsing and works over time with the wind and rain, cleaning green stains in 1-2 weeks and more stubborn black stains over several months.

Another strong point is its long-lasting effect, keeping surfaces clean for up to a year or longer. It is bleach-free and non-acidic, making it safer for the environment and nearby plants, although it's recommended to spray 100 feet away from water bodies and flush plants before and after application. Each 48-ounce bottle treats up to 2,000 square feet and has an unlimited shelf life, which is beneficial for long-term use.

However, it may take several months to fully clean heavily stained areas, which could be seen as a drawback for those looking for immediate results. Additionally, it requires careful application on a cool, dry day with no rain forecasted within 4-5 hours, which might be inconvenient for some users. Wet & Forget Outdoor is highly effective and convenient for those needing a long-lasting roof cleaner that also works well on various other surfaces.

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.