Sorry about reposting pic, but it seemed relavent in this instance. It could be bore water stains. does it have a sort of metallicy look to it? if it does then that would be my guess. CLR can remove some light bore stains. Do it in the shade though and on a cool panel. Do it panel by panel and rinse thoroughly after each wash.. Failing that it may need a really light buff to remove. Dont let any hack do this to your new ride though or you'll have hologram central on your bonnet.