I've got that white Austin stone on an outdoor patio in my backyard. It's getting mildew on it in places and scrubbing with soap and water isn't doing much. I don't want to pressure wash it because I don't want to knock out any chunks of mortar. Is there a solution or cleaning product I can use to get it clean and remove the mildew and won't damage the stone? Also, the patio is stained concrete so I need to make sure whatever I use doesn't damage that either.
How to clean Austin stone?
GalvestonWader
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