I have the shark steamer also. I have light almond tile with light almond grout. The steamer doesn't really do anything for the grout. But it's great to get up drips, foot prints and spills. When we first moved into our house, I had DH convinced that the grout was dark brown. Till he noticed the color next to the baseboards. I recommend having them cleaned and sealed by a professional. Then it will be done once and for all. Oh, if you do get a steamer, get the extra box of replacement pads at the same time. It seems like they change the head shape every few years. Mine is no longer available in that size, but thankfully, I have 4 pads that are reusable after a wash in the washing machine.