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Black limestone-how to clean before sealing

(3 Posts)
evelynj Fri 05-Jun-15 23:08:56

We've just had this big step laid. Builder said to leave it 2 weeks before sealing but it looks patchy. Anyone know the best way to clean it? I'm tempted to get hot water with washing up liquid & a nail brush & scrub but guessing that would be bad

evelynj Fri 05-Jun-15 23:11:45

Picture!

evelynj Wed 10-Jun-15 21:29:11

Bump in case anyone has any advice before I get the fairy liquid out....

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