I am going to use one of my cameras outdoors and decided I should take it apart and check for fogginess. Sure enough, I had the same problem… yet a little different. The gasket around my sensor is clear silicone and not the black foam seen in photos so far. The glass piece and the gasket were stuck to the camera structure when I removed it. The sensor itself appeared to be clean. The glass piece was not completely covering the opening in the gasket for the sensor, and the cloudy area on the glass was just where the sensor opening was on the gasket, as you can see in my photos.
After cleaning the glass on both sides, I accidentally broke it trying to pick it up with tweezers so as to not have fingerprints on it. So that’s gone now… and I had to clean up tiny shards of glass. I hope it’s not an integral part of the camera. I guess we’ll find out.