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I’ll repeat don’t use acid on natural stone especially limestone and sandstoneYou would need to go down on your knees and clean with some watered down Phosphoric Acid which breaks down the cement. I usually do it with rubber gloves and a small scouring pad and dip it in the solution and lightly work it in. That's the only thing that breaks down the cement and then you can clean it.
Just go into a corner and do a test patch. Quick clean with pad and water down acid then wipe away with a cloth dipped in clean water. No point leaving it looking like that.
I'm the same. I think the problem is when one lets it dwell and it gets a chance to eat into the slab. fwiwI lay them and clean them and always use brick acid. Wet it down, work a small area at a time and rinse after. Never had an issue…..yet. ?
I know I've seen you post before aying that and if you're confident using brick acid on stone fairplay to you.I lay them and clean them and always use brick acid. Wet it down, work a small area at a time and rinse after. Never had an issue…..yet. ?
Personally wouldn’t want to use it on either once damage is caused it’s difficult and expensive to remedyI know I've seen you post before aying that and if you're confident using brick acid on stone fairplay to you.
I'm sure with the emphasis being on a thorough pre wetting / soaking of stone and a weak dilution? Perhaps several weak treatments rather than anything too strong?
But I think it's also important to differentiate between sandstone and limestone. It may be posoble to safely use brick acid on sandstone but definitely not on limestone.
It is an accepted scientific fact that hydrochloric acid dissolves limestone as @Dave B has already said. This can easily be checked online with all the detail of why this happens
Yeah I agree mate. And it's unforgiving stuff - as soon as it comes into contact it's working and if there's an adverse reaction - too late. Damage is done.Personally wouldn’t want to use it on either once damage is caused it’s difficult and expensive to remedy