7 Best Chemical Roof Cleaners 2025 in the United States

The Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover is a versatile chemical cleaner designed for a wide range of outdoor surfaces, including roofs. One of its main strengths is the new & improved nozzle that attaches to a garden hose, allowing you to spray up to 30 feet high, which is particularly useful for hard-to-reach areas.

The product's application is straightforward: spray on a dry, cool day and let it work over time with natural elements like wind and rain – no rinsing required. However, the time it takes to see results can vary significantly. While green stains may disappear within a couple of weeks, more stubborn black stains could take several months, and long-established stains might need up to a year to fully clean. This extended timeline might be a drawback for those looking for quick results.

Safety-wise, the cleaner is bleach-free and non-acidic, making it safer for use around plants and animals if proper precautions are taken. However, it’s advised to keep it away from bodies of water and to flush plants with water before and after application. With a coverage of up to 2,000 square feet per bottle, it offers good value, but heavily stained or porous surfaces may absorb more product, reducing its effective coverage.

The cleaner is ideal for homeowners looking for a long-term solution to moss, mold, mildew, and algae stains on various surfaces, including roofs, driveways, and decks. It is not suitable for those needing an immediate cleaning solution.

Wet & Forget Outdoor Moss, Mold, Mildew, & Algae Stain Remover is a versatile cleaner designed to tackle various outdoor stains on multiple surfaces, including roofing materials. The product is ready to use and comes with a high-capacity trigger sprayer, making it convenient for application. One of its notable strengths is the ease of use—no scrubbing, rinsing, or pressure washing required; you simply spray it on and let it work over time with wind and rain. This makes it suitable for users looking for a low-effort solution to cleaning their roofs and other outdoor surfaces.

The cleaner’s effectiveness varies: lighter stains can be removed within a few weeks, while heavier, long-established stains may take several months to clear up. This might be a downside for users needing quick results. Safety-wise, the product is bleach-free and non-acidic, reducing the risk of damaging surfaces and making it safer for use around plants, although caution is advised near water sources. Additionally, its environmental impact is mitigated by the recommendation to use it away from lakes, ponds, rivers, and streams.

Compatibility with various materials, including concrete, canvas, and upholstery, is a plus, although users should ensure it is suitable for their specific roofing material before application. The cleaner has an unlimited shelf life and is capable of treating 60 - 180 square feet, but heavy stained and porous surfaces will absorb more product, potentially requiring a larger quantity. Wet & Forget is an effective, user-friendly chemical roof cleaner ideal for those who prefer a hands-off approach, but it may require patience for the most stubborn stains.

The Wet And Forget Moss, Mold, And Mildew Control3 is a spray-type chemical roof cleaner that is easy to apply. With a generous volume of 128 fluid ounces, this product is designed to cover significant surface areas, making it efficient for large roofs. The application method is user-friendly, requiring no scrubbing or rinsing. Simply spray it on the affected areas and let it work over time, which is convenient for users looking for a low-effort solution to roof cleaning.

This product is highly effective in eradicating moss, mold, and mildew. Safety is another strong point, as it is designed to be non-acidic, non-caustic, and biodegradable, making it safer for both the user and the environment. It is compatible with a variety of roofing materials, including shingles, tiles, and asphalt, reducing concerns about potential damage to the roof. However, being a chemical cleaner, there are potential environmental impacts to consider, although the product aims to minimize these with its biodegradable formulation.

Weighing 8.9 pounds and with dimensions of 4.5 x 6.2 x 10.5 inches, it is reasonably portable for outdoor use. Despite its strengths, one drawback could be its best sellers rank, indicating it is not the most popular choice in its category, which might be due to competition or price. Users looking for an eco-friendly, easy-to-use roof cleaner that delivers on its promises may find this product to be a worthwhile investment.