How Do You Remove Oil & Rust Stains From Concrete?
Concrete is a highly porous substance and, therefore, a very absorbent surface. Driveways and garage floors are often made of concrete, and work done on cars or other machinery can leave tricky rust and oil stains. Fortunately, with a little time and patience, and depending on the severity, the size of the stain and how long since the substance touched the concrete, it is possible to remove it on your own.The Army Corps of Engineers recommends various ways to remove rust and oil stains. For light stains, mix 1 pound of oxalic acid per gallon of water, apply it to stained area, and wait 2 to 3 hours. Go to step 2. If it is a deep stain, go to step 3. Scrub the surface with stiff brushes while rinsing with clear water. For deep stains, make a poultice of 11 ounces sodium citrate, 2 quarts lukewarm water, and 2 quarts 12 ounces of glycerol mixed with diatomaceous earth (which looks and feels like talcum powder) or talc. Apply this mixture to the stain with a trowel, and leave it for 2 to
