How to Remove Oil Stains from a Concrete Floor or Driveway
For new oil stains the first removal attempt should be with dishwashing liquid, soap, and a nylon bristle brush. Although concrete is a tough material, a metal bristled brush should never be used because it could alter the texture of the area you scrubbed, making the stain stand out more than before.
To begin, soak the area covered in oil and the surrounding concrete with water. This will prevent the oil you remove from making a secondary stain. At this time you should also consider where the dirty, oily water from the floor is going. It is irresponsible to let it run into the storm drains. Absorbing the waste with cat litter and then discarding is one method; contact the local authorities for other recommendations.
After the concrete driveway or floor is wet, begin by applying dishwashing liquid directly to the oil spot. Using the nylon bristle brush attempt to remove as much of the oil stain from your floor or driveway as possible. The dishwashing liquid acts as an emolysifier and helps to lift the oil stains. Remove overly soiled water and then add more dishwashing liquid and water for tough stains. Keep in mind you may have to do this several times to completely remove the oil stains.
For older stains you should try the dishwashing liquid method first. Sometimes even older oil stains can be removed with only this method. For more persistent oil stains, a solvent such as kerosene could be used on your concrete floor or driveway. Using solvents can be dangerous, be sure to read all safety precautions and know how to dispose of the items you use if you decide to use a solvent to remove an old oil stain off of your driveway or floor.
Muriatic acid can also be used to remove an old oil stain, but you run the risk of etching the concrete by mistake. If you have to use this method to clean your concrete driveway or garage floor, be sure to dilute the acid in a one to ten solution of muriatic acid and water. You may also want to test an inconspicuous area before using this method.
To remove oil stains from a driveway or concrete floor using muriatic acid or a solvent wait until the area is dry before beginning. Be sure to wear gloves and goggles as well as make sure that the area is well ventilated before beginning. Most of the time you want to apply the acid or solvent with an old rag and then properly dispose of them once you are done cleaning your driveway or garage floor.
If you are hesitant to use a solvent or muriatic acid, you could consider staining and sealing your concrete floor. Be sure to clean the concrete as thoroughly as possible before beginning. If you take the time to seal your floor other stains will be easier to remove in the future. Homeowners who are interested in this should look at “How to Stain and Seal Concrete Floors” for advice and step by step instructions.
