Cleaning Tile Grout

This article really goes into the physics and chemistry of dirt in grout–a substance that has peculiar properties that are hard to clean with just one approach. For instance there is usually soap scum settled on it so that what is stained lies underneath. Listed are good alternatives to bleach, particularly hydrogen pyroxide. http://www.mnn.com/your-home/at-home/stories/secrets-to-cleaning-tile-grout