Typically, I use a solution of bleach, cleaner and water to remove mold from exterior stone. I let the solution dwell for a time, keeping it wet, then I agitate and extract. However this case looks rather heavy duty and I was wondering if there are any other processes I might use.
Begin forwarded message:From: Stuart Young <santafefc@sbcglobal.net>Date: June 29, 2015 at 3:20:38 PM CDT
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