My cell phone lens that *looks* dirty; or, I'm not even sure it qualifies as a lens — it's the transparent cover. See the photo below.

I'm not sure if the lens was always like this or it happened at some point after I got it. It looks dirty and impossible to clean. I tried using lens cleaner (alcohol?) and some paper I bought for cleaning the lens of my DSLR, as well as just rubbing it out with my t-shirt (hey! it's just a cell phone camera):

![enter image description here](https://i.stack.imgur.com/VHcKm.jpg)

Any ideas what to do about it?