I bought one of these at Home Depot, it is a brush head:
http://www.homedepot.com/Cleaning/h_...atalogId=10053

The wood handle is sold separately, I bought that too. This stands in a corner in the bathroom. I use it to clean the tiles in the tub.

A bottle of Tilex hangs off the towel bar nearest the tub (I actually have a bar IN the tub, so mine hangs there.

After each shower, I try to spray the Tilex. Now and then I grab the brush and run it over the tiles.

Having the right tools makes it a bit easier; my back resists cleaning the tub tiles, too!