How to clean exterior stone | Hometalk
Oct 19, 2016· When we had our stone patio built, I asked the stone mason what to clean the stone with. His answer, "White vinegar and water, mixed half and half." You can use large sponge (Lowes has them in the paint section). You can also use a stiff bristled brush with the vinegar/water mixture. Be careful if you decide to use a pressure washer.