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.

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover is a convenient, ready-to-use cleaner that comes with a high-capacity trigger sprayer. This makes it easy to apply on smaller surfaces like porch steps, headstones, and planters. It's designed for a variety of materials, including concrete and upholstery. One of its significant strengths is that it requires no scrubbing, rinsing, or pressure washing. Simply apply it and let natural elements like wind and rain gradually clean the surface over time.

Users can expect green stains to disappear within 1-2 weeks, while more stubborn black stains may take several months to clear up. Long-established stains could take up to a year to fully remove, but the cleaned surfaces can stay tidy for a year or longer. This long-lasting effectiveness is a notable advantage for users seeking low-maintenance solutions. The product is bleach-free and non-acidic, making it safer for various surfaces and less harmful to the environment. However, caution is needed around water bodies, and plants should be flushed with water before and after application to minimize any negative impact.

Each 64-ounce bottle can cover between 60 to 180 square feet, depending on the surface's porosity and the extent of staining. The cleaner has an unlimited shelf life, but its effectiveness heavily relies on environmental conditions, which might be seen as a drawback for those seeking immediate results. In essence, Wet & Forget is ideal for users looking for a hassle-free and long-lasting outdoor cleaner, provided they are willing to wait for the product to work over time.