Does anyone know how to get rid of tarnish off of a baitcaster? The chrome accent pieces usually at the line guide or thumbar have it and it bugs me. Haha. Any suggestions or help would be appreciated.

Simichrome seems to polish anything.  That's the best I have found.

A can of Simonize?

Can I use it on plastic?

HMMM...I don't know about plastic, their website says furniture, cars, and floors.  If it's plastic I would try Mr. Clean Magic Erasers before anything else.  Magic Erasers are pretty amazing, I wouldn't be suprised if they do it for ya.

Yeah, some of the thumbars on Revo's do that...but what i did was just order some black thumbars  from Lew's and replaced them. Not expensive either. That so called chrome just doesn't hold up well, makes them look cheap.

Maybe try a good automotive cleaner wax. I've used it on street bike fairings, so it's safe on plastic.