I've wanted to paint some of the factory emblems on my Mustang and I've never had luck painting over the chrome. It never worked for me on model car parts, so I don't know why it would on plastic emblems. There are a few methods; you can spray Easy Off oven cleaner on the chrome and let it sit for a few hours and its supposed to come off. I've also heard that letting it sit over night in a bath of Coca-Cola works too. I tried both of the above methods with no success. The method I will show here is using bleach. Remove chrome parts from vehicle. Clean off any heavy dirt/residue. You can also scuff them with a green scotch bright pad. That seems to help the bleach work quicker. Put the chrome parts into a plastic container/bucket or similar. I would advise it not be something you intend to eat from later! Pour in the bleach. Fill it up to completely submerge the parts. Some you may have to turn over. I would use the regular bleach, not the splash-less stuff. After about an hour you will see these black streamers and other residues come up from the parts.... Give it a good 24 hours to soak. When you return the bleach will look like this.... Dump out the bleach. You can see chrome (and copper) being striped from the parts... Scrub off the parts with some old tooth brushes or scrub brushes. You will repeat this process several times until all or most of the chrome and copper coating comes off, using fresh bleach after each "bath". I would give it a good 24 hours between baths. You can also scrub the parts again with some scotch bright pads to clean them up. Just remember not to scratch the raw plastic. Eventually the parts will look like these. Paint, dye, or coat however you see fit. Hope this helps anyone who has thought of this before.