Concrete driveways often become stained with various substances over time. Stains on concrete require special techniques to completely remove them from the surface. Properly removing stains on a concrete driveway depend on the type of stain and equipment being used. The techniques to use depends on your specific circumstance
Pressure Washing Concrete
A pressure washer is a quick way to remove many common stains on concrete driveways. However, the pressure washer will need to use a chemical cleaning agent or detergent to clean the concrete surface. A home improvement center typically has pressure washers for rent and can recommend the best cleaning agent to remove stains on the surface of concrete.
Removing Chewing Gum
Chewing gum on the surface of your concrete driveway can be removed by freezing. The easiest way to do this is to use ice cubes to harden the gum. Apply an alcohol-based solvent to the gum that will turn it brittle. You can then use a scraper to remove the gum deposit from the surface. Steam cleaning at a high temperature is another option that can be used to loosen the gum so it can be washed away.
Removing Coffee Stains
Coffee spilled on the surface of a concrete driveway typically leave a brown stain. You can remove this type of stain by using soapy water and a small amount of bleach. Scrub at the stain with a hard bristled brush and then rinse the surface with clean water.
Removing Salt Deposits
The deposits of salt on concrete is known as efflorescence. This can occur during winter when snow on the roads is melted with salt. Salt use to melt snow on a driveway may also leave a deposit. The color of salt deposits is usually white and can make the concrete look faded. You can easily remove salt deposits from a concrete driveway using a stiff bristled broom. Loose deposits of salt can also be removed by using a vacuum or pressure washer.
Removing Fungal Growth
Areas with high moisture can lead to fungal growth on a concrete driveway. The best way to kill fungal growth and remove it from your driveway is to use a chlorine bleach. You can apply the bleach directly on the deposit of fungal growth or dilute it with water. The deposits will appear brown in 24-hours or less. A stiff-bristled brush or a broom can then be used to remove the deposit. Another option to consider is to spray high-pressure water on the surface.
Removing Oil and Grease
Fresh stains of oil and grease need to be covered with an absorbent material, such as cat litter. You will then need to apply a degreaser to the stain after removing the cat litter. Rinse with clean water and check the surface to see if the stain is sufficiently removed.
Removing Rust Stains
Rust stains on the surface of a concrete driveway need to be given the once over with a broom with stiff bristles. You can then apply a cleaning solution that will remove any remaining rust from the concrete.