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Discussion Starter · #1 ·
Hi,
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?
Thanks,
Gary
 

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Water it down, throw some sand on it, and scrub it around. If it's light and fresh it might work.
I think efflorescence cleaner "in a bottle" dilluted would work for this too. I know it works on paver stains, and stuff like lime and calcium buildups and deposits that may be on pavers or flagstone. Its sold by most hardscape suppliers in a gallon for $20-30. Dillutes down a lot so it lasts a while, foams up when brushing it on the area your cleaning.
 
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