How can I clean the nicotine out of plastics?...

you have to "flash it" or "flame it" with a torch but do it carefully ....... there are a few videos online of people doing it you could look up its actually quite simple

Prob. not nicotine. Most likely just yellowing plastics which happens over the yrs. No way to remove it.

If it's nicotine, then Krud Kutter will remove it, but be careful, as it eats any latex based paint (usually the white coating behind plastics, marquess, backglasses), but a quick swipe over with instant rinse is usually safe. (Test with a dark cloth).

However, this likely isn't nicotine, but rather bromine (from flame retardants) or something else in the plastic that reacted to UV. In which case you can try to do a Retr0brite treatment on it and it MAY work.

http://retr0bright.wikispaces.com/

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I've tried the retrobrite on pinball plastics before. It is amazing on molded plastics like the sttng shuttlecraft, but it does not work on the flat screened plastics like you have here. It actually will destroy the graphics before afecting the yellowing.

I'm working on a T2 with the same yellowed plastics issue currently (and a few broken). Seems the T2 plastics are unobtanium. Boo.

It is not nicotine and "flaming" it or using retrobrite is not going to help. The plastics on T2 are always yellowed (they must have used a different type of plastic on this game). I've never found a solution other than to live with it.

I experimented with a yellowed clear plastics. I wet sanded the shit out of it thinking I would eventually remove the bad..discolored layer..then buffed and flamed polished.

Other than it being baby ass smooth..it didn't change the coloring

The problem is the yellow goes all the way through the plastic.