Pests live off your leftovers—all those little crumbs you fail to sweep off the floor and remove from other household surfaces. Where there’s no food, there’s no infestation. Still, while this concept sounds simple, we all know how much diligence it takes to maintain a clean home. You'll never get the upper hand, though, if you leave pet food out in the open day and night, where any number of pests may be feasting on it. The wise course? Keep pet food stashed except at designated mealtimes. Afterward, rinse out the bowls and stow them away until it's time to feed the pets again.