Thanks all!
I used clear Windex to remove the protective layer which took about an hour. I liked Jeff’s idea about pulling it off with an adhesive tape, but I would not have had the courage to try that without the advice offered here in advance.
I have some high grade automotive plastic polish which I think I will try to see what effect it has on the overall appearance, which isn’t bad as it stands.
If the polish works out well, I will let everyone know. If not you can expect silence from me…. out of embarrassment.
Jeff