Wash with warm soapy water and rinse well. The warm water opens up the fibers, allowing them to release the locked in dirt. You may also put the mop pad in the washing machine and then dry them in the dryer on low. DO NOT USE fabric softeners of any kind as the chemicals clog the microfibers, making them less effective. DO NOT USE bleach either because it corrodes the fibers over time, making them less effective. DO NOT IRON