I dont have any, saw some at the junk yard, they looked very oxidized, from my understanding these things are sealed, so was wondering if its only the surface that gets oxidized and if its possible to polish them? Didnt have time to inspect them because the junk yard was closing, so if I get them, i should have to worry about there being any oxidation on the inside right?

 

Just hit them with some plastic polish and they will be good as new. As far as oxidation goes, I dont remember how they are sealed but I'm pretty sure they come apart, just stick them in an oven for a minute or two and pry them open, clean 'em out and then reheat them so they seal.