Mix a bleach solution in the pump sprayer by combining 1 quart of bleach, 1/4 cup of TSP and 1 gallon of water. Swirl the container to mix the ingredients but do not shake them.
Wet down all plants next to the house with a garden hose and cover with tarps to protect them from the bleach. Put on slip-proof shoes before heading up the ladder.
Spray the roof with your bleach solution, covering all the shingles. Wait 15 minutes before moving on. If the solution appears to be drying on the roof, reapply in the middle of the 15 minutes.
Wash down the roof with the garden hose. Use plenty of water and the highest pressure possible. Your shingles should be brighter and cleaner than before.
Things You Will Need
- Slip-proof shoes
- Garden hose
- Pump sprayer
- Oxygen bleach is gentler on shingles but also gentler on stains. If you bleach frequently, oxygen bleach is a better alternative.