I've used a product called Zap Restorer. I bought it at Sam's Club (but it's available through TV offers as well). You can use it full strength right on tile or grout and it whitens really well. It's inexpensive ($10 a bottle) so it would be worth a try!

i found a product in illinois called WORKS, now it is in walmart, and other stores on the west coast. tolet bowl cleaner is easier to find then the tub and tile cleaner. just put in on, let it sit for 5 min, and rinse off. it really WORKS.

I found a product in Lowe's that has flowers on the front of the bottle. It cost about 8.00 and it smells great. I did my entire bathroom floor. You must put a glaze restorer on when done.

You have hopefully conquered your bathroom grout problem by now. To keep it clean, you may want an easier way than your previous struggle. You may want to visit the 'Home Care Store' at www.shopEZ.unfranchise.com and look at the SNAP line of products. In particular, try the SNAP Creamy Scouring Cleanser. It works great on grout. For grease, there is the EcoSolve 2000 product. This contains microbes that actually eat any petroleum based product (safe for people and pets, though) and converts the oil to water and carbon dioxide, so the remains don't clog any drains and cause later problems.