iPhone 4S Otterbox Issue

hello, here help.

have otterbox defender series case iphone 4s.

but, screen looks greasy, constantly. in, screen protector. screen on phone isn't greasy-looking.
isn't water-mark issue, see bubble on screen or whatever. screen protector looks greasy. there fix this, or going have griffin survivor (which thinking anyway..)

 

nope used defender before , built in protector described. greasy looking

 

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