Rust stains can get on your tub either from old plumbing or from metal objects left sitting around the edge. These stains can be removed from your tub by using the proper cleaning products.
This is a page about cleaning well water stains from a bathtub. Minerals from well water can leave stains that are tough to remove. Removing them as they occur will help keep them from building up.
This is a page about removing hair dye stains from a bathtub. Newly dyed hair often has residual dye in it, which can stain your bathtub after washing your hair.
ThriftyFun is one of the longest running frugal living communities on the Internet. These are archives of older discussions.
My sewer backed-up into the bath tub. How do I clean and sanitize the black and dark brown stain from the tub?