Yes I have been facing similar problems and I am set to dicussing a few steps below. 1) you can utilize Oxygen Bleach 2) using Chlorine Bleach and Baking Soda 3) using a Steam Cleaning Machine. If you attempt these tips for evacuating them. Provided that it is an only a couple of spots and your floor tiles have an exceptional hard surface that won't scratch effortlessly, cleaning tiles as this ought to be simple.