I have black and white 12 x 12 granite tiles on my kitchen floor with charcoal gray grout. I clean the tiles with the granite wipes (from Dupont) I use to clean my countertops. But my urban kitchen is teeny tiny (56 sf). My grout lines are so thin and so dark that they have never been an issue.

I have granite tiles in my sunroom, kitchen and family room. The grout lines are so small(normal with granite tiles)and they are taupe color. I wash the floor with a neutral cleaner and go over with a microfiber towel on the end of a mop, to shine it up. It comes out like new every time and it is 6 yrs. old.

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