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Discussion Starter · #1 ·
I put some mortar in the back of the joints of a red sandstone wall to provide some support for the top row of stone that was sliding all over the place. It rained and now there is a little mortar film on the front of a few of the stones. Water and scrubbbing did not do anything. Is there a cleaner that can be used that will not harm the red sandstone?
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