Keep yourself and your family healthy by sanitizing your kitchen sponge after every use. Sponges pick up bacteria that thrive in damp places. A recent study by the nonprofit NSF International ranked the following areas to have the most germs: dish sponges or rags, kitchen sink, toothbrush holder, pet bowls, coffee maker reservoir, bathroom faucet handle, pet toys, kitchen counters, stove knobs and cutting boards. Researchers found Salmonella, E. coli and Staph bacteria. Besides careful cleaning, they recommend consistent hand-washing to prevent infections.