Scrub and loosen the black algae on the affected concrete using the push broom with short strokes and heavy.
Black algae on concrete driveway.
To remove it fill a bucket with 2 gallons of water and 1 cup of bleach.
Mix one cup of bleach.
If left untreated it will grow and the situation will get worse.
Choose from roof ox siding ox or wood ox.
Also it can be tough to remove as it will stubbornly cling to outdoor surfaces.
How to get black algae off a concrete driveway step 1.
Algae can grow on multiple surfaces including your porch patio awning siding fence sidewalk and even on your outdoor furniture.
Both of these methods can also increase wear and tear on your concrete and make your driveway seal not last as long.
Second the black stains on your retaining wall and concrete are most likely caused by the same mold or algae.
Black algae is a type of fungus that thrives in moist areas in both the sun and shade.
Hose off as much black mold as you can.
From a distance it looks like ordinary garden dirt but you can t wash it away with the hose.
It sounds like you have black algae built up on your driveway.
Mix a solution of chlorine bleach detergent and water.
Scrape off any remaining black mold with a spatula.
Black algae gloeocaspa magma appears on your driveway as dark grey or black streaks and smears.
If this is not the case pressure washing is often quite effective in removing mold and algae from pavers bricks or concrete.
Prepare a strong detergent solution.
On mar 14 2019.
Black algae will also make your sidewalk look as though it s been rubbed with soot see photo above.
Put on a pair of rubber gloves to protect your skin.
Home improvement expert danny lipford recommends the following formula.
Cleaner today ox products can be used on siding wood concrete patios and retaining walls.
Place a hose on its most powerful setting to clean off the concrete.
Either way the same product can be used to clean them both.
If you ve tried bleach or a pressure washer to clean up concrete stains you know the hassle involved.
How to kill black mold on concrete step 1.