There are a few things to do, but buffing is one of them. The acid in bug splatter can eat through paint, especially on bumpers, where the flex agent and plastic surface usually mean compromised paint, especially on Suburus, Nissans, & Kias. If the buffing with an abrasive pad or polish doesn't work, and it doesn't and the etching isn't whiter than the paint, you might want to look into wetsanding. Love to hear other opinions about this.