that shit's a pain in the ass to clean off too. and it STINKS!!
It happened to my friend's car when he was out of town...he had it parked somewhere with a For Sale sign on it...it got egged and somebody called his cell and told him, then he called me to pick it up. I picked it up and washed it at night, but I think it was sitting all day in the sun because it smelled rotten as hell!