Cleaning grout inbetween porcelain tile floors?
I just installed porcelain tile floors only a few years ago, but the grout already looks terrible- some areas are really dark with dirt and other areas are much lighter which I'm assuming is the natural color. Even worse, the installer put in thick lines of grout so the dirty grout really pops.
And, I installed a lot of porcelain, about half the first floor so there's a lot of grout. I tried scrubbing with a brush and water but that didn't seem to make much of a difference.
So, what do I use to clean this grout? Do I use the same thing I'd to clean grout in between bathroom tiles?