I am the new owner of a 2013 Sahara that I love! I am having an issue with the tire shine that the dealer put on. When It rains the grease leaks down onto the Sahara silver bumper and stains it. Any tips on how to clean it? Pressure washing doesn't work. I tried a vinegar solution but that didn't really work either. It does come off with a lot of elbow grease and some strong buffing but I'm just wondering if anyone else had this issue and if they found a better solution.