Oxalic acid? Patio magic et al have it in or "deck restorer".
Removing ''hard water" stains from brick work.
Apr 18, 2019
Last reply: 7 years ago
7 Replies
We live in an area with especially hard water and had an issue with a toilet overflow- fixed some time back. However, it left some stains on the wall. I had hoped they would fade but they hadn't. Scrubbing and power washing hasn't helped.
Does anyone have any suggestions, please?
Viakal?
brick/Patio acid = HCl
+1
Brian Reay explained on 18/04/2019 :
Ketchup I was once told, would remove it.
it's limescale, use acid
NT
Or match the colour and paint them out? Brian
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