After doing a lot of testing in "Inconspicuous' areas with different products I stumbled across a process that was fairly easy to do and let me pick a different color than white plus didnt involve buying 15 pens of a magic marker LOL . Let me preface this by saying some of my grout was in bad shape. I mean it was bad enough that I was to the point of removing it, which is a huge job. First I cleaned the floors and grout thoroughly with this http://www.tecspecialty.com/co...id=68 I really scrubbed the grout lines and and rinsed them repeatedly. After they were dried I applied this http://www.mapei.com/US-EN/pro...a=102 My local store carried about 10 different colors and I picked out the one I liked. Not that there is anything wrong with white grout, I just didn't want it and I thought removal was my only option. I wish I would have taken some before/after photos so you could see the difference but it is quite the difference. Every one that has seen it has asked if I re-grouted the floors.