I have recently had my bathroom re tiled but the Ardex fkexible grout used has dried different colours. In some places it's dark grey and in other a lighter grey (almost white). What caused this and can I do anything about it?
It looks like effloresence (salt residue). Normally happens if there is too much water in the mix or excess grout wiped off too soon or the sponge was too wet.
Should clean up easy enough using a mild acidic grout residue remover, like the HG Extra or LTP grout stain remover.
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