Hi, didn’t really know what to look for, and only found advice to remove “fresh” insects, but not really what I wanted to find.. So to the question: Have on the grill of my A3 sportsback or at the chrome border some reddish stains, which can’t be removed with washing even with Autoshampo.. Will post a picture afterwards. Can someone give me a tip / advice how and with what I get that away? Cleansing knete? MfG