Like a CPL filter for my DSLR, this iPhone case features a polarizing lens that helps noticeably remove unwanted reflections from your photos. I believe the removal isn’t possible without the aid of this filter. Fortunately, the filter lens on this case is detachable and interchangeable where you can replace it with selections of macros, zooms and other lenses or filters. However, you might noticed that the flash is blocked by the case, so it seems this is intended for outdoor iphonetography or well lighted subjects, if that wasn’t an issue for you, the case is available for $38.
Source: Amazon, Product Page