there seems to be a lot of info out there about full restoration of minton floor tiles but not so much about just giving them a blimmin good clean. ours are in generally good condition but the cream ones have a slightly rough mottled surface that traps dirt and even bleach deosnt seem to make a difference. does anyone have any good practices or products they use for this? i have even heard people suggesting using bullit style drain cleaner on them (the sulphuric acid type) anyone done this? id also like to seal them in some way afterwards to prevent them just gettin dirt ingrained again so grateful for any recommendations on products for this too. thanks!