How to Acid Wash Limestone
An acid wash is one of the last resort solutions for cleaning stubborn blemishes and stains on limestone surfaces. Acid washing works by dissolving the limestone color to remove the stain. Limestone, like many other natural stones, is porous in nature and absorbs materials very easily. For this reason, it is important to acid wash limestone surfaces carefully. Acid washing limestone can lead to permanent damage if not done properly.
Step 1: Apply Muriatic Acid
Apply the required amount of acid on the limestone surface. Be careful not to use it in excess. Allow it to stay on the limestone surface only for a few seconds to prevent any damage.
Step 2: Rinse the Acid
Rinse off the acid from the limestone surface with a pressure washer. The ideal pressure should be between 2500 to 3000 PSI.
Step 3: Neutralize the Solution
Sprinkle a little baking soda over the treated area. This will help to neutralize the solution. Allow the surface to dry for a while.
Remember to use protective gear or clothing, like latex or rubber gloves and goggles. You should also read any application directions from the manufacturer carefully and follow them properly.