Parents of kids age 16 and under drive a car pool an average of seven times a month with three kids in the car, according to a recent survey conducted by the International Carwash Association.

And, to make matters worse, the majority of these drivers allow the children to eat and drink in the car – which might account for the fact that once the kids exit the vehicle, food is reported as the number one leave-behind odor, followed by sweat and old shoes. One respondent described the car as a "crumb-covered mess," while others reported shoe prints, trash and discarded snacks all over the interior.

Juvenile travelers have left behind such souvenirs as a dead frog pinned to a board, nestled next to a P&J sandwich in a brown paper sack, an iguana named Joe Bob and a kitten. Other forgotten items include Oreo cookies licked clean of their centers and shoved into the car door pocket, Hustler magazine and underwear.