In my opinion the ps5 controller's stupid shell and randomly placed torx screwheads makes it hard to open and work on compared to older controllers, and they use a potentiometer that's cheap and prone to drift. I've cleaned some with isopropyl and youtube guides to good effect but you'll need special screwdrivers to do so if I'm remembering right.

It's not impossibly hard but mind the plastic bits you can chip off easily if you haven't done it before!