How can stains be removed from concrete?
Stains can be removed by using wet methods with chemicals or water or by dry or mechanical methods. Wet methods consist of the application of water or chemicals depending on the nature of the stain. Treating the stain with specific chemicals will dissolve the stain substance so it can be blotted up or bleach the stain so it will not show. For example to remove blood, wet the stain with water and apply sodium peroxide powder to cover the stain. After a few minutes, rinse with water while vigorously scrubbing the stain. Follow this procedure with a solution of 5% vinegar to neutralize any sodium peroxide that may remain. Common dry methods include sandblasting, grinding, flaming and shotblasting, scabbing, planing and scouring. Be careful using steel brushes, since they can leave metal particles on the surface which may rust and stain the concrete later.
