As an aside - I wonder whether there's a point in a vehicle's life when it's difficult to remove food smells. Leaving a locker or chest visible in a vehicle is one thing, but after a vehicle has 100K or 200K miles on it, is there any practical way of removing food smells from the upholstery? In any case, visiting an active bear area is a good excuse for spiffing up the old beaters, but I sometimes wonder if my efforts aren't a bit futile.
It seems to me that bears can discern between old beaters with old food spills and cars with an amount of food stored inside. Otherwise most old beaters would be peeled open by the bears.
Now that I think about it, even people can smell the difference between fresh food and stale food.