It’s a good idea to clean your watch every 2 to 3 months to maintain its appearance and keep it in good working order:
If it is water-resistant, make sure the crown is fully pushed in (and screwed down, depending on the model) against the case, and the seals have been changed or tested at a AVI-8 Official Service Centre within the last 12 months. Only then it is safe to be washed in slightly soapy water, using a soft brush. Rinse and dry with a dry soft cloth after washing.
If you have any doubts about the water-resistance of your watch, simply clean it with a soft brush.
After each exposure to salt water, rinse the watch carefully in fresh water then dry it with a dry soft cloth.