Disoloration Of White Limestone

Hello All,

This is my first time posting here. Looking forward to learning from the best!

I have some discoloration I encountered after I sprayed straight 10% Sodium Hypochlorite on black mold on the surface of a white limestone residential brick house. This was done about one week ago. Since then I have used a power washer on the areas discolored with no affect at all. Please note that the mortar in between the brick does not have the discoloration. In addition, one area of the house treated the same way that had green algae looks great with no discoloration. What should I have done differently and what can I do at this point. Anything advise would be greatly appreciated.


Roger Barnhart
Central Texas Window Cleaning
Austin Texas

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Perhaps this might help.

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