How to Remove Stains from Asphalt Shingles


Stains are not uncommon on asphalt shingles. Moss, dirt, sap and other gunk get on your shingles and leave unsightly stains. It is important to clean stains from your asphalt shingles sooner rather than later. Stains like mildew, moss and algae will spread further -- and can even begin to eat away at the shingles -- if left untreated. You can safely and effectively remove stains from your asphalt shingles without calling in the professionals if you use the right cleaning products and the proper technique.

Things You'll Need

  • ¼ cup trisodium phosphate
  • 4 cups household bleach
  • Pump garden sprayer
  • Long-handled scrub brush
  • Garden hose
  • Mix 1 gallon of hot water, ¼ cup of trisodium phosphate and 4 cups of household bleach into an empty pump garden sprayer. Secure the top to the sprayer tightly and shake it up a few times to mix the ingredients.

  • Spray the cleaning solution onto the shingles. Although you can just choose to clean the stained areas of the shingles, it's best to clean the whole roof so you are left with an even, uniform appearance once you're done.

  • Allow the cleaning mixture to remain on the shingles for 15 minutes. Scrub the stained areas with a long-handled scrub brush, if necessary, to loosen up the gunk.

  • Start at the peak of the roof and rinse in a downward motion with water from the garden hose until the water runs clear. Let the roof dry completely, then inspect the surface for any traces of the stains. If any stains remain, repeat the process on those spots.

Tips & Warnings

  • Wear rubber gloves, old clothing and protective eyewear when using trisdoium phosphate and/or chlorine bleach.
  • Wet down your plants, grass and bushes below to protect them from the cleaning solution. For added protection, cover them up with plastic sheeting.
  • Have someone help you by holding the ladder so you can safely reach the roof. Use safety harnesses whenever possible while working on the ladder and/or roof. Wear rubber-soled shoes with good gripping. Shingles are very slippery when wet, so try to stand on dry spots at all times.

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