I have a lot of orange Eames Herman Miller chairs and they are from the 60s. They have been used in a lunch room and are in various conditions, none are damaged or frayed, but I want to bring back the lustre of the polypropelene finish. Some are stained. Is there a good way to do this without damaging the plastic?

The best thing to use on fiberglas chairs is teh Novus systme of plastic polish. It's made to be used on everything from fiberglass boats to any kind of small plastics. We use it to restore all our fiberglass chairs and bakelite as well. Check it out www.vintageswank.com