Hauser,
I replaced mine. My original ones were so dingy from 30 years of aging (and my uncle who owned the car was a heavy smoker) that there was no saving them. I bit the bullet and bought new ones. They look, well new. Perhaps not quite as finished and arguably a little "cheaper" looking if you look closely, but they are new, clean and they work. Someone paid $80 for my old set on eBay so at least my cost was partially defrayed.
Michael Salemi
1969 280SL
Signal Red w/Black Leather
Restored