Without using machine power, you are going to have to use muscle power. Cut back any plants that are growing up or down the retaining wall. If the wall is not too large, use a spray bottle of strong detergent With bleach. Use a stiff scrubbing brush or breed. Wet down an area you think you can handle and scrub from the top of the wall down. If you can, rinse the wall with a water hose. Otherwise, use gallon jugs of water. When the wall is dry, paint with a mildew retardant paint. Follow the directions carefully for outdoor use. Best wishes 😇
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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I recently used Wet & Forget on some wood siding and haven't seen results, yet. I sprayed it on the house about a month ago and wanted to see if I should give it ...
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Without using machine power, you are going to have to use muscle power. Cut back any plants that are growing up or down the retaining wall. If the wall is not too large, use a spray bottle of strong detergent With bleach. Use a stiff scrubbing brush or breed. Wet down an area you think you can handle and scrub from the top of the wall down. If you can, rinse the wall with a water hose. Otherwise, use gallon jugs of water. When the wall is dry, paint with a mildew retardant paint. Follow the directions carefully for outdoor use. Best wishes 😇
Stiff brush, a bucket of cleaner and hose to rinse off.