First of all: many of these Cover / Cases scratch the phone by small movements and dirt / dust between cover and back.
I previously had a Avanto Structe Wallet. This I have also rarely cleaned. To the camera, there were some slight wear on the mobile phone. But: In this case, my phone is studded with real quirks, less scratches. Luckily the Mateiral is dyed!
Whether it was due to excessive dirt, or this case is particularly prone to - I do not know. My opinion, and thus Renz Sion only 2 stars.
Positives: It is compared to the previous cover considerably thinner and does little to. Actually, I really liked it! In combination with a film on the back again 4 stars. Conclusion 3 stars!