I use WD-40 on the car mats to remove tar and I will also a wet warm towel and just let it sit on the dead insect for a few then wipe clean. This way the water will soften the insect after a few without having to rub. I will also use WD-40 to remove the insects and at the same time use it for any outside tar around the lower panels. It also will leave a coating behind for future problems. I have use WD-40 for many yrs it is cheaper to buy then the Bug-Tar removers out there and work much better.