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How to Clean Algae and Moss from a Roof. Apply the bleach solution with a garden sprayer. Let it stand on the surface for about 20 minutes, then rinse it off with spray from a garden hose. Don't let the bleach solution stand on the roof for more than 30 minutes or so without rinsing.
Getting Rid of Moss and Algae on Concrete. Household bleach mixed half with lukewarm water and a teaspoon of dawn dish liquid in a gallon plastic container applied by pouring and brushing with a push broom on a sunny day. Test the area you spray before rinsing off all of it.