I'm in the process of moving into an old historic home and boy, does it need work! The porcelain bathtub was disgusting, years worth of stains. For three days, I tried every "soap scum, mildew remover, etc." you could think of. Nothing worked (cue freak out) until I came across two lifesaving products.
So, including some scrub brushes from Dollar Tree, I spent around $16 and it looks like I bought a new tub! (The pink bottle in corner is just a cleaner I already had to wipe down tile.) I was so thrilled with outcome, I wanted to share with everyone! Hope this helps!
P.S. I forgot to take a legit "before pic". This before pic is right after I had started using the pumice stick. You can tell where it's been used on the right of pic.
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.