Grout Shield Restoration System 5 "Fantastic product" Colin 02 February 2015 Bought this to clean my shower grouting after being quoted £360 by a professional! The pre-cleaner got nearly all the stains and mould off. Only a couple of small black mould stains remained but these were covered by the colour seal, after a couple of coats. The test of time will tell how good the colour seal is at warding off further stains, but my grouting looked as new. Very pleased.