[stanski]

The plastic chrome can be cleaned with ultra fine steel wool. It the chrome is cracked or bubbled or peeling, not much you can do with that.
As for the plastic, best prep is brake cleaner, soap and water, then brake cleaner again. As for paint, pick your color as there are several variations, but satin black and steel grey are most common. I have really good results with the Krylon paints, they spray well onto plastics. Always mist on a light coat and let it tack up before the full coat to prevent fish eyes.