Whoa.
If you put your iPhone in a regular ziplock bag, you can still use it. As in, you can tap the screen all you want and it’ll respond just fine.
I honestly had no idea that this worked - my mind is blown. This means I can use my iPhone when I walk in the rain. I can read recipes off it in an oily, wet kitchen.
The kitchen would be the best place for this. I usually resort to using my knuckle when I need to access my phone and my hands are dirty or oily.