To clean a clip-on, first open it, then clean it with a soapy wipe. You can also clean it under running water, then disinfect it.
Please allow it to dry or dry it well, then short press the middle to confirm the cleaning process has ended. When the blue light blinks on the right side, the clip-on is ready to be charged or paired again.
/!\ You cannot soak a clip-on in water nor clean it in a washing machine.