The greatest benefit of Spray & Forget is that it allows you to achieve impressive results without the hassle of pressure washing, scraping, and scrubbing. This convenient formula is long-lasting, using nature to provide residual effects every time that it rains.

Once sprayed, this product can work for a year or longer by breaking down and cleaning away tough stains and preventing future growth. This is extremely convenient if your stains are in hard to reach places, like a roof, as you only need to spray once or twice and wait to the formula to act. For roofs, the manufacturers recommend that you reapply Spray and Forget roof cleaner for preventive maintenance once every 3-5 years—which, depending on where you live, cleaning your roof could have been an annual chore otherwise.

Why you should use Spray and Forget!

In addition to convenience, the delicate formula of this product also offers many advantages over other methods of cleaning. Many other comparable DIY stain removal products on the market utilize harsh chemicals to get the job done. Spray and Forget, on the other hand, is bleach free, non-corrosive, non-acidic, and non-caustic, meaning that it is much gentler on your surfaces. Even pressure washing can cause damage to your exterior surfaces because of its high intensity. With Spray and Forget, you don’t have to worry about chipping away your garage paint or damaging nearby landscape or plants because the product uses rain for a natural and gentle rinse.

This product offers a great value as an affordable alternative to hiring a professional. Once gallon of Spray and Forget roof cleaner can create 10 gallons of the diluted mixture that will cover up to 2000 square feet. To see just how cost-effective this product is, click to see current prices.

How to Use Spray and Forget

This product can be used on virtually any outdoor surface including you:

  • Roof
  • Garage
  • Driveway
  • Siding
  • Patio
  • Pool Deck
  • Fencing
  • RVs
  • Playground equipment
  • Pots
  • And more

To use this product, mix one part Spray and Forget Outdoor concentrate with five parts water and place the solution in a gardening hose. Spray your outdoor problem surfaces until the stain is fully saturated. It is important that you apply this product on a dry surface on a day when there is no rain forecasted for at least 24 hours. This is because the product needs time to soak into the stain so that it can breakdown growth and start cleaning.

Do not rinse the product after spraying!

Once applied the product will start taking effect, cleaning away green stains within 1-3 days on average, and dark stains will fade away within the first two months. Roof stains may take a bit longer to completely disappear, sometimes up to 6 months, but once cleared Spray and Forget should keep your roof clean for at least two years.

To keep mold, mildew, and algae at bay and prevent future stains from occurring, the manufacturers recommend that you reapply Spray & Forget every 1.5-2 years for non-roof surfaces, and every 3-5 years on your roof.

Keep in mind, as the product starts to take effect it is normal for stains to appear darker or change color within the first few weeks. This is a good sign that the product is working because mold naturally turns brown when it dies, and when it rains this debris will simply wash away—leaving you with a cleaner surface.


  • No scrubbing, pressure washing, or rinsing required
  • Highly cost effective
  • Only needs to be used once every 2-3 years on roofs and once every year on other surfaces
  • Green stains disappear after 1-3 days on average
  • Works on virtually all exterior surfaces
  • Bleach-free
  • Non-corrosive, non-caustic, and non-acidic
  • Not hazardous to nearby landscaping, plants, or pets when applied properly
  • Provides residual effects for a year or longer
  • Easy application
  • Eco-friendly and biodegradable


  • Roof stains can take up to six months to disappear
  • The amount of time it takes to show visible effects depends on how often it rains in your area
  • Does not work if it rains within 24 hours after initial application
  • Some stains turn darker or change color before disappearing (this is a sign that the product is working)

Our Verdict:

Overall this is a great product for those who want an easy solution for removing stains caused by mold, mildew, algae, and lichens. The easy spray on application doesn’t require any grunt work like scrubbing, hand washing, or pressure washing, and offers an extremely cost effective way to get rid of tough stains without the use of harsh chemicals.

Spray and forget reviews have boasted the effectiveness of this formula and its long-lasting effects. If you find that cleaning away mildew, mold, and algae is a constant chore, this product can take the work off your hands by using the power of nature. This product really does let you spray it and forget it, working gradually with every rainfall.


Based on customer reviews and our own experience, this product has shown to be very long lasting compared to other brands. For example, for roofs, once your stains have disappeared, the product should be able to keep the surface stain free for at least two years, with a recommended preventative maintenance spray every 3-5 years. It is true that it may take a while for the stains to completely disappear in the first place, in some cases up to 6 months for roof stains, but once they are clear the product is able to keep future growth at bay for an impressive period.

Compared to other stain removal methods, this product offers a highly cost effective way to get rid of even the most stubborn moss, mold, mildew, and algae. Of course, if you need instant results, you may be better off investing in a pressure wash, but keep in mind that this high-intensity cleaning method could damage your property by chipping away at paint and accidentally spraying nearby landscape. Spray and Forget, on the other hand, may take a little longer to show visible effects but will provide long-lasting results with a safe formula when applied correctly. For this reason, the value that you get out of this cleaning method is far greater than the one time instant results that you may get with a pressure wash.

Overall this is one of the best rated DIY stain removal products on the market. With just one gallon you can cover up to 2000 square feet, offering a lot of cleaning power at an affordable rate, for virtually any outdoor surface.


Based on customer Spray and Forget reviews and our own review of the formula, we give this product 4/5 stars.


To see for yourself why so many homeowners are already using Spray and Forget for hassle-free mold, moss, mildew, lichen, stain removal, give it a try today!