I have an old milk pail that I bought in an antiques store a long time ago. It is shaped like a cone. The diameter at the bottom is about 18 inches and at the opening at the top about 8 inches. I was told it is made of tin (the handle looks like wrought iron) and that it came from a farm in Maine. When I bought it, it had been nicely finished in a soft satin sheen. But over the years it has become dull and blotchy. I'd like to refinish it, but don't know what kind of agent is right or how big a job it would be.