These definitely had *something* on them. I tried lacquer thinner (didn't have any acetone) and it barely touched it. It was coming off with 0000 steel wool and chrome polish, but so was the skin on my fingers!
I sprayed some stripper on it and got 99% of it off. The rest cleaned up with steel wool and some elbow grease.
I thought that were just dirty at first, but there was definitely some old clear or something on them.