Although the leaf stains may be concentrated in a small area, it’s best to clean the entire slab. Otherwise it can look patchy if you only clean the stained areas. [3] X Research source
Darker, tougher stains may not be removed with detergent. You can also prepare the cleaning agent in a watering can. This can help with applying it during the cleaning process.
Consult with local authorities about runoff disposal. Some chemical contaminants are not permitted to enter storm drains. [8] X Research source
For deep-cleaning concrete, a pressure washer that can reach 3,000 psi (pounds per square inch) is recommended. [10] X Research source If using a pressure washer, begin with a low pressure setting first so there’s no recoil when the machine is started. [11] X Research source
Some detergents can be dispersed using a pressure washer. This is dependent on both the detergent and the pressure washer that you use. [14] X Research source Keep the areas wet, don’t let the detergent or stain remover dry on the surface. [15] X Research source
Don’t use a wire brush as this may scratch your concrete surface. [17] X Research source
You may have to repeat the process if the stains have not been removed completely. Organic stains are carbon-based, making them the toughest to remove. [18] X Research source
The concrete must be clean and completely dry before you apply a sealant. Always follow the manufacturer’s guidelines for the product you are using. [22] X Research source Look for sealants that are “breathable”. This allows water to escape without getting trapped in the concrete. [23] X Research source
