I removed the soap scum from my glass shower last weekend.
I sanded with Mirka Ceros abranet 220,320, 400,600, Rotex 125 Platin 1000, 2000, polishing felt hard, sheepskin. I used meguiar polisher with the felt hard. It is better than new.
My oven less than one year had the same problem, glass fogged.
Lowes said is a common problem and they paid for the first time to fix it. They guy polished it but it was not thorough as I did my shower.
The problem was inside the 2 glasses, he disassembled the door.