Plants that have grown along a concrete surface or gotten crushed from foot traffic can stain your concrete green. This green stain can then turn black as it mildews. Removing these stains can prove difficult without the right tools. Follow a few steps and restore your concrete to its original color.
Things You'll Need
- 5-gallon buckets (2)
- 4 gallons water
- 6 oz. dishwashing detergent
- 4 oz. bleach
- Rubber gloves
- Scrub brush
- Power washer
Mix 2 gallons of water with 6 oz. of dishwashing detergent.
Scrub the stains using the scrub brush and detergent mixture, which will break up dirt, grease and plant oils. Scrub until the stains resist further scrubbing. Make sure to wear your rubber gloves.
Mix 2 gallons of water with 4 oz. of bleach.
Scrub the remaining stains with the bleach mixture, which will remove most of the remaining black or green colors from the concrete.
Power-wash any remaining stains and cracks with a power washer of at least 750 pounds per square inch (psi). The power washer will remove loosened particles from cracks or pores in the concrete.
Tips & Warnings
- Some people power-wash without scrubbing. Although power washers can remove particles and much of the stain, the water will not remove all stains in the pores; some stains will remain. Scrubbing with detergent followed by bleach, then power-washing, will create a surface that seems virtually new.
- Photo Credit David Sacks/Lifesize/Getty Images
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