10 Best Roof Cleaners 2025 in the United States

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.

The Concrobium 27400CAL Mold Control Aerosol is specifically designed to tackle mold, mildew, and musty odors, making it valuable for maintaining cleanliness in areas prone to dampness. This product uses an EPA-registered formula that works by crushing mold spores as it dries, leaving behind an invisible barrier that prevents regrowth. With an odorless composition and no bleach or harsh chemicals, it is safe for use on a diverse range of surfaces including roofs, making it an environmentally friendly choice. Its application is straightforward: simply spray it on the affected area and allow it to dry, without any need for scrubbing or rinsing. This ease of use can be particularly appealing to homeowners looking for a low-maintenance option.

Covering between 100-150 square feet per 14 oz can, it offers reasonable coverage for small to medium roof areas or sections needing treatment, but may require multiple cans for larger projects. While effective at mold prevention, it's important to note that this product is not intended for stain removal, potentially requiring additional products for complete cleaning if stains are present. Its unscented nature is a plus for those sensitive to strong smells.

Users who require more immediate results on pronounced mold and odors might find its gradual action not as satisfying as instant cleaners. Additionally, it’s more suited for indoor application per its specification, though it can be used outdoors with caution to environmental factors affecting performance. The Concrobium 27400CAL Mold Control Aerosol is a solid choice for individuals seeking a gentle yet effective mold control solution, prioritizing safety and environmental impact without the hassle of harsh chemicals.

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.