Clean it as soon as possible. Sea spray leaves salt behind, and salt can attract moisture and cause corrosion over time.

For a non-weather-sealed camera like the D5100, don’t rinse it under running water. Instead, use a clean cloth that is damp—not dripping—with fresh water and wipe the entire exterior of the camera and lens several times to dissolve and remove salt residue. Then dry everything with a separate clean, dry cloth. If you still see white spots or residue, repeat.

Pay attention to the lens exterior as well as the camera body, especially any extended zoom sections. Be cautious around openings, buttons, dials, ports, and the microphone area so you don’t push moisture inside.

If salt water may have gotten inside the camera or lens, or if you notice ongoing residue, stiffness, fogging, or other odd behavior, professional cleaning is the safest option. Given the risk of internal corrosion, a service shop can be worth it for peace of mind.