My Aunt gave me this tip about 30 years ago. Clean up
baked on
stains from
pans by adding a teaspoon, or so, of biological washing powder to water in the pan and bring to the boil. Make sure that you keep an eye on the pot as it's prone to boiling over. it make take a few minutes of boiling for really hard staining. Wash the pan in your usual way and any residue will come off with just a wipe. This has even worked when my stock pan has boiled dry & I thought I'd need to bin it.