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The stone on my house which I think is Bath stone or Limestone is getting dirty. I’m not sure if it’s pollution, acid rain or something else.

I tried to give it a quick scrub with water and a gentle soap but I didn’t have any luck.

Can anyone tell me the type of cleaning agents that might be able to help or if this needs something more extensive?

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  • Could you provide a photo? I have done a lot of historic home renovations and do not remember ever seeing limestone used other than cut blocks for foundations. Is it outside ? Sorry I did not see the picture, that looks more like concrete with a scratch coat covering to me. The discoloration possibly iron in the water. – Ed Beal Dec 12 '20 at 15:54
  • I think "bath" stone means limestone from near Bath , UK. I would clean it with any acid and a stainless brush. The acid will dissolve the limestone so be judicious. – blacksmith37 Dec 12 '20 at 17:24
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I have no experience of cleaning this stone, but I do recommend caution using any products you might find yourself.

Cleaning this type of stone is a likely to be specialist job, especially on a historic building. There is a risk of damaging the face of the stone and any work you carry out might be restricted by local regulations for listed buildings, conservation areas etc.

https://beta.bathnes.gov.uk/sites/default/files/2020-01/clean_bath_stone_0.pdf

https://borealabode.com/bath-stone-cleaning-repair

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