i just washed my car today. i live in southern california so it doesnt rain much. it only gets dirty if i park in areas with lots of trees because of dust and bird crap. for some reason, when my car is clean, i feel as if it performs better and faster. its also nice to have good clear visibility on the windows. when its clean, there is no corrossion to the paint from bird crap, and you can put stuff on the car without having the dirt scratch the paint.
a clean car can make a first impression on someones personality or habits