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ANy idea

crystal vision

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Hard to tell from this photo, id stay away from it personally but if I had to I'd go for sandpaper (long job) could try a chemical, but I can't tell if it's caused by rainwater leaking down or by rainwater mixing with whatever is in the mortar. If it were carpets I'd do a ph test on the stain to work out which chemical to use.

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 softwash    but use   gel max    its sticks to it and is great stuff


but if ur new to it i say maybe  find someone to do it  as   you need a bit  of knowledge before messing with chems

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