I recently died my hair dark brown and some of the dye got in the bath. It is an original roll top enamle bath and it has stained it. I have tried everything to get it out, bleach, white spirit and even nail varnish remover! Nothings shifting it, it's ruined!!! Any suggestions would be appreciated?

Hope you can help.

Did you just pour on the bleach and scrub really hard? If so, that isn't going to work. Fill the bathtub with bleach and water. Let the bleach water soak overnight. It takes a while for it to work. I think the harsh cleaners (nail varnish remover and everything else you didn't mention you used. etc...) will ruin the enamel. The stain will fade in time. I know you are frustrated but have patience. Let it soak.

I have nothing to offer to help, but I do have a word of warning. Someone may suggest using lemon juice to remove the stain. That may or may not work. However, the juice will certainly etch the enamel. What was once a smooth, glossy surface would be pitted, rough feeling, and have a matte finish. Even if you dilute the juice, the enamel will be damaged.

Go to a salon and ask for some colour remover... it's the stuff a colourist uses to lift colour from hair and, since it is specifically formulated to remove hair dye, it just might do the trick on your lovely tub.It would be pricy, but if you can't get the stain out, a good restoration man will be able to do so.
After you get the stains out, preserve your tub by having the restoration man in to put a new coat of sealant on your treasure (I love those roll top, enamel on cast iron tubs)

Here are a number of things you could try...
Most are non-abrasive.

Spots, Spills and Stains

One that specifically addresses hair dye...
Hair dye on washbasin: Try PEROXIDE GEL (ie. Clearasil) - smear a little on there and leave it a while (something like oxyclean might work too but if it's liquid it will run off - that's why the gel). Peroxide will fade hair dye when it's on your head so it should do the same on your sink. It may take a few times reapplying, but the mark should fade. (one of the other things it mentions on the site is to mix cream of tartar with peroxide...this might be a good option)

I've heard of using cream of tartar and hydrogen peroxide for removing stains from stainless steel sinks. (cream of tartar is a miracle cleaner) It should work on the tub.

I did find some info on diy .

Cleaning an Enamel-Clad Iron Sink

Materials and Ingredients:

2 parts borax
1 part baking soda
Plastic container
Damp sponge

1. Mix 2 parts borax with 1 part baking soda in a plastic container, and stir well. Either dip a damp sponge in the mix or sprinkle the mix into the sink and scrub. The mixture won't scratch!

* tip by Linda Cobb, the Queen of Clean®

You could try the Mr. Clean magic eraser. Whren I was dying my hair burgandy, I would get hair dye all over the bathroom. Very messy! The Mr. Clean Magic Eraser worked wonders!! It go the dye off my porcelin tile counter(even on the wood.)

I'd hold off on the Mr. Clean Magic Eraser as a last resort. While it appears really soft and you can remove marks off of most anything, it does leave small scratches. The instructions tell you not to use on anything smooth.