Cleaning The Apple Watch Ultra

All,

I used my new Ultra on dive trips and while I am very diligent about rinsing it in fresh water after each dive, I was wondering what other methods folks have used to clean their Ultra's after prolonged usage in salt water?

I have an ultrasonic cleaner that I use on my Garmin Descent and it works fantastic. But the Garmin is a very different device than the Apple Watch.

Anyone else use any other solutions to clean their Apple Watch Ultimate?