Pocster Posted June 25 Posted June 25 Someone lazy in our household left concrete blocks on the decking for some considerable time . On removing them get these white marks . Tried cleaning them with various things but won’t budge . This permanent or can be removed ? Some people ! Buy materials ; leave them for a bit and then cause more work . I don’t know ! Tsh !
Conor Posted June 25 Posted June 25 More likely a chemical reaction between the wet concrete and the boards.
Pocster Posted June 25 Author Posted June 25 46 minutes ago, Onoff said: I'd try a bathroom / kitchen limescale remover. Tried that.
Pocster Posted June 25 Author Posted June 25 Just now, Mr Punter said: Brick acid? Do a test patch first. yeah I did think of things like that. But is a visible area so its tricky to "test" a patch......
Onoff Posted June 25 Posted June 25 What about Pink Stuff? Been surprised at what that shifts, calcium deposits engrained on glass etc.
Pocster Posted June 25 Author Posted June 25 3 minutes ago, Onoff said: What about Pink Stuff? Been surprised at what that shifts, calcium deposits engrained on glass etc. Bit rude mate! 1
marshian Posted June 25 Posted June 25 49 minutes ago, Pocster said: yeah I did think of things like that. But is a visible area so its tricky to "test" a patch...... Put another concrete block in a non visible area so you can test it there?
Pocster Posted June 25 Author Posted June 25 1 minute ago, marshian said: Put another concrete block in a non visible area so you can test it there? 😃. yeah I think those marks were left by blocks that might have been there a bit of time.... Like 1 month ..... or 6...... or perhaps it was a yr or 2 🫠 BUT! As a long term experiment which therefore stops me fixing it now its a very plausible test!
marshian Posted June 25 Posted June 25 2 hours ago, Pocster said: 😃. yeah I think those marks were left by blocks that might have been there a bit of time.... Like 1 month ..... or 6...... or perhaps it was a yr or 2 🫠 BUT! As a long term experiment which therefore stops me fixing it now its a very plausible test! Perfect solution - glad I could help 2
Russdl Posted June 25 Posted June 25 Not the same materials, however we had a cast iron seat on our porcelain tiles, when I moved it there were little rust marks where it had been stood. Nothing shifted those rust marks, tried everything… …and then I used a Brillo Pad, and that did it. May work for you? 1
crispy_wafer Posted June 26 Posted June 26 gpt reckons vinegar, or citric acid and leave for 10 minutes to try and dissolve the calcium deposits... Might need a few repeats.
Pocster Posted June 27 Author Posted June 27 Gently electric sander on it with water . Not perfect but much better 👊🏻 1
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