Ahhh, Yes, How I do miss those little critters splattered all over the front of my car or pick-up. (no RV yet) Anyways, a couple of tried and true methods that have worked for me in removing the remains of the darely departed. WD-40, spray on wait a minute and wipe. Peroxide some say 20% mix with water, but I tend to do overkill.
Same thing spray on wipe off.