We have a large kitchen, back hall, utility and back toilet all tiled with cream porcelain polished tiles. Gorgeous when clean but impossible to keep. The guy in the shop tried to warn me but would I listen? 2 dc, another one on the way, a large dog and a new build with no tarmac or concrete outside yet, you can imagine.... even a good steam mop streaks them. Is there any way to remove the polished layer to leave matt finish? My life would be so much easier 
Any suggestions much appreciated.