I took off my incipio plastic case off today because I noticed a buildup of lint around the top and bottom ports and to my surprise the back of my Lumia 1520 seems to have spots in the corners. I tried washing it off with a cloth and some water but it did not change what appear to be stains of some sort. I was going to try using 409 or another chemical cleaner but didn't want to mess up the matte coating on the back. Any thoughts or anyone else have this happening to their 1520?
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