Muddy boots leave behind dirt, leaves, water, and anything else that happens to stick in the mud. They can make a car floor extremely messy, but if you have the right floor mats, you can keep your carpet clean and easily discard the mud. Car floor mats made from easily rinsed materials, such as plastic or rubber, are ideal for muddy boots. Even if the mud is still wet, you can simply hose it off and put the mats back in the car.