Immediately after diving, before the seawater on the camera (housing) dries, put the camera into fresh water.
Rinse well with fresh water and soak in fresh water for at least 30 minutes.

After taking it out of water, wipe it off with a towel and dry it completely before opening the housing.

Be sure to clean the O-ring.
First, remove the O-ring from the housing without damaging it, and wipe it with a soft cloth.

Clean the O-ring groove on the housing side, and then put the O-ring lightly coated with grease back.