Hey everyone - I have a bathroom that was roughed in when i bought my first house and finally getting around to finishing it. I have one question concerning the floor. The cement floor has some area (where the pipes run) where the cement is roughed up a bit and not level. My question is, must this be repaired and smoothed out before putting a sub floor OR can i lay a sub floor over this and then put the tile down? If I need to repair the cement, does anyone have any suggestions on a product to use to do this? More then likely will try to find something at Home Depot. Thanks for any input!

This new floating floor of ceramic tile has been covered with the dust from the mudding etc while construction in the area was finished. It is quite heavy in places. How do I clean it. I was made to understand that I cannot use water.????