I would also be worried about critters tucking acorns into other spots.
I once had a Saturn and used to park under a tree that produced a lot of acorns. This was at my mother's home on Lake Huron. I used to drive up after work every Friday and drive home on Sunday night. One day I took it in for some kind of mechanical repair. After an hour, the mechanic came to find me in the dealer lounge and asked me, "Lady, do you know you have a lot of acorns in your engine?" (Like I prefer to drive around that way!) Turns out he had to remove a bucketful of acorns that a squirrel or chipmunk had tucked into every little spot he could find in the engine compartment. I imagine the critter was disappointed every Sunday evening to have his hoard drive away until the next weekend, but apparently he persevered.