How do I fix lens dirt?

Good morning,

That's quite unfortunate. I can't say I've personally had this issue but I can see the frustration.

When you say the "lens cover", is the the little glass piece on the back glass or something entirely different.

Here's some solutions:

All 3 cameras show this: At this point if your in America I'd send it into apple or do self service repair. This is likely sensor level damage that can't be cleaned

1 camera shows this: if you can take off the lens piece, clean it but not before:

Doing a visual inspection. If this does conclude as dirty, give it a clean if you can. If not, try inspecting the physical lens piece and if that doesn't show, that sensor has damage to it on a sensor level.

Let me know how this goes