Possible front camera problem.

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Asteroid

Possible front camera problem.

I'm not sure if this is a problem or not.  Every once in a while while using the front facing camera a messga will come up saying something like for best results clean the camera.  Is this just a reminder or does the phone think the camera is dirty?  I wipe my phone down all the time and it's never dirty when the message pops up.  My concern is that there is something inbetween the front glass and the camera.  It looks ok but who knows.  Anybody else get this message all the time?