Waterproof Case Fogged Up? Here's What To Do. The waterproof case is a hermetically sealed enclosure to keep water out. Conversely, it also traps in moisture present in the air. This moisture may condense as internal components of the camera warm up, and they collect on the walls of the waterproof case. Oftentimes in places where we don't want them to be in: The lens. When this happens, here's what you do. Wipe the outsides of the waterproof case completely dry. Take the camera out and put in crumpled paper towels in the waterproof case to wipe it clean. Don't forget to wipe the display window too. Dispose the paper towels, and put in some fresh ones. Close the door. Leave it for a couple of minutes while you wipe the camera too. ONLY USE A LENS CLEANING CLOTH WHEN CLEANING THE LENSES. Put the camera back in the empty case. Now you have several choices should you need to go underwater with your camera. 1. Purchase Anti-Fog Inserts online. They're reasonably cheap. They go into the sides of the camera inside the waterproof case. They will absorb any moisture trapped in the case. 2. Use silica gel dessicants usually found in shoeboxes, or anywhere else you may find them. Use the same way as Anti-Fog strips where they fit inside the case. 3. DIY Anti-Fog Insert: Cut up and fold paper towels. Use them the same way as above. Not as fast acting as the above 2, but works great! The ones on the left are Anti-Fog strips. O, and, don't touch the camera with wet hands prior to putting it inside the waterproof case. For rather obvious reasons. Cheers!