Why don't we ever see Cockroaches in our usually crumb-filled cars?

For one, cars may get too cold. Cockroaches dislike the cold and refuse to stay in the car. Secondly, water is essential for cockroaches' survival and reproduction. Cockroaches require food every seven to ten days, they must take in water every three days. Perhaps a cockroach might be attracted to a stretch limousine with a leaky wet bar, but most of us don't drive limos.
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