Driving to work...see loose gravel on road (I would usually avoid, but little behind heading to work)...with no sign posted....workers are laying down top coat of gravel with...then coating with tar...well fortunately nothing is on my paint...but my wheel wells are covered with sticky tar and gravel...tried a pressure wash with their "pre-soak", "wheel cleaner" and the power wash...but still looks like hell in there...any advice??