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Skin irritation is a pretty good sign that it’s about time to clean it.
If the wristband is made of silicon, you can just clean it with soap and water.
I think I’ve read somewhere that the watch itself should be washed with normal water instead. I guess there are some gaps and holes where soap isn’t welcome.
If you have a fancy metal wristband, soap will do an acceptable job, but an ultrasound bath would be better.
But it is difficult to acquire here on earth.
As uranium and thorium naturally decay underground, they produce some helium as well. That’s why you can literally make a helium mine. On earth it’s also a finite resource, because once released into the atmosphere, it will eventually escape the atmosphere and end up in space.