When there's a bad smell in your car (girls said it smelled like cat or fish food, I feared I had something dead in my engine), do a REALLY thorough clean out before you take it to the garage.
I have a dread of "mommy car" along with "mommy purse", but the girls aren't in my car as much as they were and I try to keep things as neat as possible. Garden tools are in the trunk all summer and there are other things that stay a while. But mostly, I empty things out. Or so I thought.
Otherwise, you may entertain your mechanics and embarrass yourself when they discover a potato, probably there since you did latkes in December, has rolled under the driver's seat, is wedged there and is rotting!
Easily remedied, but never to be forgotten...........