WD40. I just had to do this with a steel bath. Spray WD40 to soften it, scrape/peel off, repeat as necessary. It doesn't take all the work out of it but makes it a lot easier.
CT1 Multisolve is very good once you have cut off as much as you can manually - costs about £7.50 a can and my first one has lasted for several bathrooms with no signs of running out yet - left me wondering why I bought 6 of the things !
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