You probably keep your floors clean with regular mopping. But when you're finished, don't just wring the water out and store until next time. Instead, give your mop a good soak in hot, soapy water, and then rinse well in hot water. Wring it out thoroughly and let it dry standing up. Removable mop heads can—and should—be run through the wash on the delicate cycle with bleach to disinfect.