I have them , you have them Car Zombies!  You hate them, you try to kick them away and they keep coming back.  Yeeccchh!

A Car Zombie

Who else gets them and hates em? It's that snow that mixes with gravel and Mud on the underside of your truck or car shortly after a snow event. Then when it gets cold as it did recently, the freeze up and you have to chisel them off, or try to use your boot to knock it off and only end up hurting your toes

That's the name I cam up with, can you suggest a better name?  Share you pictures of your CAR ZOMBIES!!