Front Camera is blurry.

I think its got a lot of dust and dirt in it. I had a small lift on my speaker grill from day 1 of my purchase and didnt really care, but I think its been accumulating a lot of dust on my front facing camera. Its made it really blurry.

Does anyone know a way to clean the camera? I'm guessing the grill has to come off and then it'd be easy. But I don't know how to open to grill without damaging the phone or putting the grill back without making it even more loose than it should...