20 Sep 2017



It’s hot. It’s humid. It’s your typical summer in Missouri. And if you have a shingle roof, the heat may be taking its toll on it without you even realizing.

In our previous blog post, we discussed the dangers of algae that can feed on filler agents between asphalt shingles. They can also have another undesirable side effect: stains on your shingles. These stains may not be dangerous, but they’re certainly unpleasant to look at. Not to worry! With the right tools, you can have your roof looking good as new again.


You could spend huge amounts of time and money browsing store after store for a good roof cleaner, but creating your own mixture is surprisingly easy and effective. Use one quart of bleach (chlorine is more effective than oxygen-based bleach), a gallon of water, and ¼ cup of trisodium phosphate. Be careful not to mix the bleach with any ammonia-based products to avoid producing poisonous gas. Spray the solution on your roof from bottom to top with a garden sprayer on its lowest setting. Let it sit for 15 minutes, then rinse the entire roof down with water. Be slow and deliberate with your rinsing; that will ensure no parts of the roof are missed, which could lead to to corrosion or unsightly bleaching.

Bear in mind several of these pointers before undertaking this method:

  • Watch the weather. Intense sunshine may evaporate the cleaning solution before it has had time to work its magic. Overcast days are ideal for maximum effectiveness.
  • Be wary of wind. Your roof may need cleaned, but odds are your neighbors wouldn’t take kindly to your spray flying over onto their roof!
  • Wear a full body harness and make sure the roof surface isn’t conducive to you slipping and falling.
  • Make sure not to let the solution sit too long. The corrosion could permanently damage your shingles.
  • Keep the pressure washer setting low. Those things are powerful and could easily cause damage.
  • Consider any plants on the ground that may be hit by bleach runoff. You could lightly spray them with water or cover them with plastic beforehand.


As tempting as it may be to attempt stain removal on your own, nothing quite beats the peace-of-mind of leaving a potentially dangerous job to the professionals. If you want to make sure the stains on your roof are good as gone in a quick and easy fashion, call Absolute Roofing at 417-869-0444. After all, we live for this stuff.