1. DON'T EAT IN YOUR CAR. It may seem harmless but trust me, every time you eat in your car crumbs pile up more and more.
2. Don't let the rugrats make a mess in your car.
3. Clean messes up quick, before the stain sets in... or you forget about it.
4. Keep a trashbag inside your car in the middle console, or behind your headrest.