What can I use to clean my patio blocks from green mold/mildew?
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Use Wet and Forget safe for all surfaces
Bleach will work.
Here is an article that might be helpful - http://www.greenacres-va.com/resource-center/brick-paver-care.php - good luck
Wet and Forget. It comes in a gallon container that you dilute with water. Spray on and it works when it rains. Takes a little time but works wonders.
Outdoor bleach. Regular bleach will hurt your grass. I cleaned my deck and and front porch with it and looks brand new.
You can buy Lilly Miller Moss Out in a spray bottle that attaches to the hose.