On Tue, 03 Jun 2008 05:29:59 GMT, blueman wrote:

The grout on our mudroom tile floor has gotten real "dirty" looking
over the years. The tile is a tumbled Carerra marble type.

I would like to clean it and then reseal (using Porous Plus).

Any suggestions on either a good commercial grout cleaner or a
homebrew potion that will remove grime and dirt stains to bring back
more of the original grout color?

Thanks

For a homebrew; formulate a wet paste with TSP, Trisodium phosphate.
Apply the paste in a small area to test. Allow it to set, nearly dry
and then clean with water.

Your tile is not the same as mine, but TSP is safe and has really
cleaned up some tiles/ grout in the past.