The good news with regard to removing permanent marker from a metal surface is that it is easier to remove Sharpie from nonporous surfaces. This is a guide about removing permanent ink (Sharpie) from metal.
How do you remove red Sharpie from a brass doorknob?
By joshnoodle from Mauldin, SC
How should I go about removing Sharpie from an old tin lunch box without removing the paint?
Just a suggestion try clean the marks off from the inside. Tin should be thin enough for the derutent hot water wax. Which they use for cleaning spray paint off walls. Thanks for your hits and tips.
If you have any acetone or nail Polish remover it should work. Ithe worked for me