Dust Under Glass Over Camera

I've had this phone for about three weeks and after around two weeks, I noticed that the pictures were starting to come out fuzzy and overexposed looking. Finally realized that there was dust under the glass covering the camera lens. Unfortunately, since it's under the glass, I'd have to take it apart to clean it (or possibly send it to Amazon for warranty, if they cover it).

The issue is that even if I take it apart and clean it, the issue will come up again and I'd rather not have to constantly take it apart and clean (especially since it happened only after two weeks). Does anyone have any suggestion to prevent this from happening again, besides not keeping it in my pocket?

This seems like a poor quality design to me. I carried my previous phone in my pocket for four years without any issues.

Thanks.