This video shows a DIY way of cleaning floor tile grout. WARNING: DO NOT USE ON NATURAL STONE. However, cleaning agents shown will work very well on grout lines in between ceramic or porcelain tiles. Be sure to mop up with a good amount of water to rinse away removed soil. This process will have you on your hands and knees for a very long time. It also will not clean the soiled tiles themselves- just the grout. For amazing, professional tile & grout floor cleaning, including natural stone, see our tile and grout page and videos at cleancareboulder.com.