If you search on the archived forums you will find a post about this, but If I remember correctly it was next to impossible without damage since the ring is press fitted.
one big gamble would me immersing the remote in a bowl of alcohol and hope for the best. …
Maybe someone else has better advice…. They are super nice little remotes and without the full essence kit the wheely remotes can be used IR / Bluetooth with many beosound/play speakers!
