PLEXUS. Especially, if you have a black bike. I use it on ALL the plastic, chrome, windshield. It's anti-static, so the dust film doesn't accumulate, as quickly, and you don't have to reclean, as often! It feels nice & smooth and is lustrous, after application.
Some bike shops sell it, or buy from HDL.
I repeatedly spray it onto a cotton cloth, to apply, so, I don't waste it, spraying into the air.