How do I clean the grout on my tile floors?

Try mixing Oxiclean powder with hot water, let sit on tile & grout for a few minutes & scrub with a stiff brush. Worked amazing on my kitchen tiles & grout.

Mix baking soda, water and Clorox, brush the grout with this solution, and wipe it clean. It is a hard work, but it works ;-)

I tried everything to clean my light colored grout, some of it turned really bright and some not so much. I could never get it all looking the same. I went to a local tile store and got some grout dye. This was a very tedious task, to put on with a toothbrush, but was worth the time and effort to get my tile grout all the same color. I went with a dark taupe color. What a difference it made and it doesn't show dirt at all.

Bicarbonate soda and toothpaste