Camera housings (Underwater Enclosures ) require cleaning every time after you put them in the water. Otherwise, the dirt and salt in the water will granulate on the housing and eventually damage the housing permanently. The easiest way to clean the housing is to soak the housing in fresh water for a few minutes after using it. Of course, you have to take out the camera before doing this. If there are any visible marks of dirt on the camera, you have to deal with them specifically using a soft cloth. The ring in the lens port will need more attention as dirt can get inside the gears.