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cement staining

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Steve_Simmonds:
Hi-

I've just got a job cleaning cement and such marks from block paving and patio slabs on new builds - I'm a bit worried about taking all the sand etc out of the block paving - what chemical's best for this?

Muckypup:
steve i use an acid if it's really bad - but watch it! if its not too bad a pressure washer will get rid of it but have some fine sand as it will all get washed out of block paving. ;)

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