Used a Haier Ultrasonic Jewelry Cleaner. I used some warm water with a little liquid dishwasher detergent. Removed the band from the watch and let it clean for about 7 minutes, then went over it with a toothbrush on both sides. Rinse and dry. The secret to longevity is to keep the dirt/dust etc out of it because it turns into an abrasive, like sandpaper.