Very tenacious trace of cement pot on stone terrace

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  #1  
Old 10-17-18, 03:42 AM
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Very tenacious trace of cement pot on stone terrace

I left a pot made of some kind of cement for some years on my terrace.

I tried to remove the trace with a metal brush rubbing like crazy, but to no avail (see photo).

Any idea of a chemical solution to this?

Thanks
 
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  #2  
Old 10-17-18, 04:58 AM
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Part of the problem isn't the ring the pot left. It's that the pot protected that part of the concrete while all the rest weathered and mildewed. I would start with a good pressure washing of the entire terrace. That should clean and lighten the rest to more closely match the area under the pot. Then if you still have a ring I would try a mineral dissolving cleaner like CLR or use straight white vinegar.
 
  #3  
Old 10-17-18, 05:07 AM
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I agree! along with PWing I'd scrub the terrace with a bleach and TSP solution to help remove the years of grime. An old broom works well for scrubbing.
 
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