Use it only as a last resort to clean stains.
Cleaning oil from concrete with muriatic acid.
The acid works well on concrete and on many masonry projects because it neutralizes alkalinity.
The surface becomes etched and clean which allows for the proper adhesion of a new coating.
Make sure the detergent you use is ammonia free.
Before washing your driveway with muriatic acid try a degreaser on oil stains and a solution of one part bleach to three parts water on mold and mildew.
Muriatic acid is diluted hydrochloric acid and is a very potent chemical.
Mold rust and other stains can mar the clean beauty of your concrete lessening the visual impact and even the curb appeal of your property.
Scrub the gray stain with a solution of 1 cup liquid chlorine bleach 1 cup powdered laundry detergent and 1 gallon of very hot water.
It cleans concrete by removing the topmost layer of your driveway.