Google has been less then helpful. Funny enough, this post from YHL came up, http://www.younghouselove.com/2008/03/bathroom-breakthrough/
and they have the same tile I do - and, I guess the same issue I have... how do you "brighten up" tiles like this? I am unfamiliar with the method they use, using peroxide...Has anyone else done this? Do you just dump it in a spray bottle, spray it on, let it soak over night, and then scrub it with more the next day?