Next position your ladder against your home and make sure it s secure.
How to remove roof stains.
Use a cleaner specially made for killing algae or by spraying a mixture of one part bleach to four parts water with tsp trisodium phosphate or other detergent added in a garden pump up sprayer.
Step 3 mix cleaning solution.
Step 1 cover foliage.
Step 4 apply solution.
How to clean roof stains wash your shingles where the sun doesn t shine.
How to remove roof stains.
Allow the oxygen bleach to sit on the shingles for 20 minutes.
Since you ll be working with a bleach mixture make sure that any greenery in the vicinity is covered up to avoid.
After that mix one part cleaner with six parts water in a pump sprayer.
Algae can be killed and the stains removed using chemical cleaners though they usually return over time.
Step 5 let solution soak in.
Black streaks on the north and west facing and shaded.
Do shingles on your north west or other shaded roofs have streaky moldy stains.
Step 2 take safety precautions.
Allow the bleach to remain on for 15 to 20 minutes then rinse it off with a hose.
Cleaning the shingles first choose a non corrosive roof cleaner from your local home improvement store.
Set the nozzle at the highest pressure setting and hold it 12 inches from the shingles.
Use your garden hose to soak the affected area.