The most effective method of cleaning algae and moss from a roof is with a 50 50 mix of laundry strength liquid chlorine bleach and water.
Cleaning moss off roof.
When applying roof cleaning products onto a roof on a hot sunny day it will quickly evaporate and you won t get the desired result.
Scrape off the moss.
Climb up to the roof and begin scraping off dead moss from the shingles using a putty knife or painter s 5 in 1 tool and working from the bottom up.
Use the tool to gently lift away matted moss that has gathered on the flat sections of the shingles.
Carefully place a ladder near the area of moss growth and don slip resistant shoes old clothes rubber gloves and eye protection.
Scrub at the moss with this mixture until the moss is gone.
Its recommended anyone cleaning moss off a roof should do it on a cloudy day.
Apply w ith a sprayer and allow the solution to dwell on the roof surface for 15 to 20 minutes and then rinse thoroughly with low pressure water.
If you re going to use one of these solutions to remove moss climb down from the roof and cover any landscaping that s in the line of fire with a plastic tarp.