How to clean the back camera

If I may, I'd like to add to this in that you should stick with rubbing alcohol that is a 90% or higher concentration of isopropyl alcohol. The 70% stuff we all have lying around the house has water and other additives in it that you don't want getting into your phone.

Of course, this all hinges on us thinking you want to clean the outside glass lens on the rear of the phone; if it's something else you have in mind such as some sort of obstruction inside the case that's interfering with the rear camera, then that's a whole different issue and you'll need to tell us if that's the case.