Cleaning old brick

joshjweddle

New member
What chems would you suggest for this building. Strong SH didn't do much. Here's a pic. Thanks!


grand Boulevard 2.jpg
 
Probably NMD80


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Have you tried the 8.5% at nearly full strength? True 8.5% is about the weakest we would want to be using however, it will kill algae if the stains are algae. Is it possible that the stains are mineral leaching??? Notice, the bad staining is directly below window ledges...

Mike
 
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