Mothers (and probably a couple of other brands) makes a clay block that looks like Plasticine and comes with a lubricant. Use this on your paint. The job will take an afternoon, but will take any impurities off that are stuck to, or embedded slightly into the paint. I had fuzz from my waxing cloth torn off by minute droplets of pine gum on my finish 2 years ago. The clay block worked like magic, and I keep a new one handy now, just in case.