Manufactured by TEC called "Banish" It is a non-acidic tile cleaner to remove grout haze. I have never personally used it, but it may work in your case.
Acidic cleaners are not recommended on glazed tile. If your tile is glazed, you may not want to use an acid product. "Banish" is a non-acid product.
TEC is a well known manufacturer of mortar, grout, and all the support products, but I'm sure there are other manufactures that have a similar product.