This is the first white car I have ever owned. Suddenly, I'm getting lots of grease/oil/tar on my rocker panels. I've only noticed this in the past six weeks or so. I can only think of three reasons why this might be happening now but not 3 months ago. 1-Extreme heat allowing tar/asphalt to splash on the rockers. 2-Just changed to new tires. 3-Added mud guards. These are the only things that have changed and I can't imagine mudguards causing this. Anyone with more white car experience have an explanation?