I don't know if there are any official instructions. I wash mine in hot, soapy water using blue Dawn dishwashing detergent, but don't submerge the plastic part. It has that indentation that plugs into the charging port on the device, and I don't want to take any chances on moisture remaining in there and messing anything up.

So, I hold onto the plastic "frame", swish the strap in the water and kind of rub/scrub it with my finger, rinse it and hang to dry. I purchased a second strap so I can still wear the device while waiting for the other strap to dry. I try to switch straps and wash the worn one every week to 10 days.

I throw my strap in the wash with my sensitive clothes (cold water only) and air-dry it. You should have had a bit of paper that came with the device and that has washing recommendations. They suggest hand washing but I don't hand wash anything. I have more than one so that I can rotate through while one is drying. My actual device never touches water except when being wiped down on the towel that I just used drying off with from the shower. In the summer, I will wipe the device down with alcohol to further reduce any chance of building up some type of bactria that I don't want grown excessively on my skin.

By the way - find that paper if you can as it's very clear about sun screen issues that are known to interact with the plastic. Having actually cracked my device within the first few months because I wasn't careful enough with the sun screen (I didn't read the fine print on the chemicals), I didn't use sun screen above my elbow the next summer. No cracks.

I have about 6 of them, never washed any of them. One thing that perturbs me to no end is the Velcro peeling off. Everytime I call and complain about it they end me a new band...LOL. I will have to try the superglue.

Sorry , wrong thread :-|

Yes, washed the strap when it was poorly picking up my heart rate. Placed in delicates bag, gentle cycle, air dry.

But I rinse it after each use and air dry it.