Cleaning iPhone 11
Can I clean iPhone 11 and it’s button (specially the ringer /silent switch with water and lint free cloth ?
iPhone 11, iOS 13
Here is what the folks at Apple recommend: How to clean your Apple products - Apple Support
From the iPhone info listed there, Use a soft, slightly damp, lint-free cloth—for example, a lens cloth.
And Avoid getting moisture in openings. With a few other details.