cleaning patio slabs


i put some patio slabs down and although all are ok they seem to be covered in concrete dust ,i`ve bought some brick cleaner from b&q but this does not seemed to have cleaned them, any idea`s? apart from not getting them covered in dust in the first place TIA
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A pressure washer works fine for me

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me too !!!

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Pressure washer.
I also found that whilst filling the gaps between the slabs with builders' sand, brushing the dry sand over the slabs repeatedly seemed to scour them clean (or cleaner at least)
Good luck.

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