Sweep away dirt and debris from the area with a broom.
Saturate the entire stain with degreaser. If rain is a problem, place a sheet of plastic or a tarp over the stain to keep it dry.
Allow the degreaser to sit on the stain for 15 to 20 minutes.
Rinse the area with a pressure washer. Follow the manufacturer’s instructions closely for your pressure washer.
Sprinkle powdered bleach-free laundry detergent over the area if there is any residual stain or discoloration.
Scrub the detergent into the area with a coarse-bristled brush.
Rinse the area again with the pressure washer.
Repeat the process until the stain is gone.