10 Best Roof Cleaners 2026 in the United States

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.

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.