I'm not a professional detailer. I have a motorcycle that is a mixture of black plastic body parts and a metal tank. Since it's black all the parts have small scratches and swirl marks. Hopefully there is a way to repair them, or at least make them a lot less noticeable. Where do I start? What products and steps should I use to repair them? I'm particularly partial to Meguiars products, but I'm open for anything at this point.