I use Ajax on ours although the enamel has seen better days. Yes, a good scrub with Ajax and a dishwashing pad should shift the stains especially the limescaly stains where the water has dripped. Bicarb and lemon juice mix plastered round the taps themselves and left for an hour then rinsed off makes the taps come up shiny.
I hate bathroom furniture that has been used by other people before me <shudder> . I generally like nice solid expensive things but I could definitely make an exception if I was hard up and wanting to change my bath.
had this conversation with my grandmother just a few weeks ago, about how someone had told her that you cant get vim... but you can because she had bought some and had a brand new one recently purchased in her cupboard and was showing me to prove that despite what these people were saying it does still exist.
No idea where she found it bought it though probably doesnt help much