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WebFor dark brown or black spots, and to remove moss, mold and mildew on patios in shady or damp areas: Mix a solution of 1 part bleach to 10 parts water. Test the solution on a small portion of the area. Don't use the solution if it causes discoloration or damage to the surface. If the surface looks unharmed, s crub the stains with the solution ... WebApr 16, 2016 · Here are the steps to get rid of these growths once and for all: Mix 1 part Wet & Forget with 5 parts water in a pump-up garden sprayer. Spray the affected concrete with the diluted Wet & Forget solution. Allow at least 4 to 5 hours of drying time before the chance of rain. Walk away, and let Wet & Forget Outdoor do the work for you! options trading more profitable
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WebIf you notice dark spots on concrete after pressure washing, it’s likely that the surface is damaged and that the top layer is washed off. This type of damage is prevalent in slabs … WebLeave the area for 15 minutes for the bleach to soak in and take effect. Finish off the job by using clean water to rinse off the entire patio. The black spots should be gone at this point. If not, a repeat application will do. … WebMar 3, 2024 · Azelaic acid. Glycolic acid. Kojic acid. Retinoid (retinol, tretinoin, adapalene gel, or tazarotene) Vitamin C. These ingredients can fade existing dark spots. In some … portmouth ri closest airport