Even the most talented dogs will leave small amounts of food in their Kong. But not to worry, cleaning these toys doesn't need to be too tedious. First, rinse with warm water and dish soap. You may need to soak the Kong in warm water and dish soap to loosen leftover peanut butter and other stubborn treats Then, use a bottle brush or toothbrush to scrub the inside of the toy. Rinse thoroughly. In addition, these toys are also top-rack dishwasher safe.