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New sandstone patio a mess..advice?

Posted: Fri Aug 06, 2021 4:01 pm
by catseyes
So two months ago we had a sandstone patio laid. Chose someone whos work we had seen, has been doing this for 40 years and has worked for family close by.
We started getting white marks, got them back and was told it's salt, that it will wear off, if not to use a salt remover.
I can't find a salt remover safe for sandstone but on researching, I think we have reflective staining. Do I get them to come back again? I can't see they are going to own up to a bad job.
Is there anything I can do to make it look better? This cost thousands.