Quoted from John_I:The plastics are all in tact but are completely brown!
I bought a bunch of early 60's wedgeheads a few years ago. The plastics were coated in nicotine top and bottom. I tried using Novus but had little luck. I used Dow Scrubbing Bubbles spray foam after finding a post (somewhere) saying it worked well on playfield plastics. I sprayed the top with the foam and let it work a few minutes. I wiped them off with a paper towel. I didn't feel safe spraying the foam on the bottom, so used the previous, damp paper towel to clean the underside. The plastics retained a brownish tone, especially in the clear spots, but were considerably cleaner than when I started.