What causes dark grout and how cleaning and sealing fix it.
Grout is porous, so it soaks up dirt, grease and mould.
Mopping can push dirty water into grout. See grout cleaning.
A sealer stops grout soaking up dirt. See grout sealing.
A grout colour seal makes grout look new.
Sometimes tiles are past cleaning, and it helps to know when a tiler should regrout or replace them.
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