Back in November, I bought my 2015 Jeep SRT. I've washed it as much I can, didn't take it off roading etc. However I've noticed along the back wheel well, and even on the front, there is some sort of whitish/greyish black spray. I've cleaned, and scrubbed and can't get it out. Is this something that can be fixed ? or does it have to be re-spray painted ?