You sure this "Clouding" is not on the glue side of the glass?
Yes I'm sure. It's more of a lasting imprint that stays on the glass and won't come off. Again you can only tell by holding the phone a certain way when the light is reflecting on it.
I've had Whitestone Dome glass on my phones since the S9+ and have never experienced this issue before. Can't tell if it's oil from my cheek on the rare time I answered my phone without ear buds, or if it is oil from my pillow that got on it overnight. It won't come off though.