Had my OtterBox Defender almost as long as my white Z10, but not seen any marking, does it wipe off?
Originally swiping was difficult, having to press right where the case meets the screen, and swipe up, but after an OS update that changed, so wondering if OP has updated software.
Also, Defender is only �15 on amazon.
Keeping it holstered helps a lot with dirt ingress.
Agreed. No marks here. Defender is the best case for protection. Dropped my z10 a few times and it looks brand new