What can I use to clean a scaly/stained bath, most stuff isn't recommended for use on old enamel?

[flightattendant]

Help! Is there anything? We live in a very hard water area but when we moved in, the bath was pretty clean looking. Now it has limescaley stains all round it especially where the tap dripped for a while.

It always seems to happen to me everywhere I live. Can't help thinking it's because my dear mum always offers to come and clean the bathroom when I move somewhere new, and uses something that affects the surface forever so it picks up limescale?

It is the original bath, about 1920s or 30s.

Any help appreciated!

God, perhaps we have been going round ruining lovely old baths for years

We recently had this problem. My dh looked on the internet and came up with the idea of using a paste of cream of tartar and hydrogen peroxide. It went a bit yellow at first, but when that came off it had improved matters quite a lot.

Oh! Thanks PJQ, I always wondered what was the purpose of cream of tartar! (always ruined scampi IMO )