Well, I have literally tried almost everything to clean it with no luck. Yesterday I took a heavy duty Mr. Clean Magic eraser to the grout lines, and it looks a bit better, but not much. FCA flooring installed mine--I am going to contact them to see if they have any ideas (short of removing all the grout and starting over. Fairly certain the color I have is bone as well. Maybe I'll go with dark brown next time around! Good luck!