We are mid bathroom refurbishment. Tiler has asked if we want white or grey grout. We've never had coloured grout before. I'm very tempted to go with grey as white always seems to discolour easily - especially in the shower. But was wondering how hardy grey grout is? Eg can you spray mould remover on it without it bleaching the colour. Does it discolour in general much the same as white? Anyone got coloured grout and regretted it?