How to Clean Mold off Roof Shingles

“The green and black algae are not harmful to the actual roofing material because they do not develop roots. They are more of an aesthetic issue since they make the roof look horrible. Both of these algae can be cleaned from the roof, however the green algae is far easier to remove than the black algae. If what you have are green stains, instead of black, then the culprit is moss, usually spread from overhanging trees. The solution is the same as with the algae, although a broom might be used to help gently dislodge the clingy spores. The same metal strips prevent the green vegetation from returning, but you can always help the process along by trimming overhanging trees and foliage away from the roof.”

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Mold stains form on roof shingles that are in permanent shade. The mold can discolor your roof and damage your shingles over a period of time. Not to worry, though, because you can clean the mold off with basic household bleach, as shown below.

Protect Your Plants and Lawn

Splash the plants and parts of your lawn that are close to the sides of your house with water to protect them from the bleach solution.

Make and Apply the Bleach Solution

In a 2-gallon bucket, mix up a cleanser composed of 1/4 chlorine bleach and 3/4 water. Then, add 1 tbsp. of trisodium phosphate (TSP). Using a handheld pump sprayer, apply this cleanser to the moldy shingles only, while wearing rubber gloves.

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