After washing my dad's car this evening, I found out that the side of the rear bumper is quite full of tar and stains. I tried to use Autoglym Super Resin Polish to clean it, but I found that it is quite a difficult task as it is not powerful enough to dissolve the road tar, furthermore it is quite wasteful. Then I tried out Turtlewax Bug & Tar Remover to do the job. It does pretty well, but the problem is removing the B&T Remover is quite a messy job as it is very oily. Are there any other options in getting road tar away? Will using WD40 damage the clearcoat?