How to Clean and Maintain an Underwater Camera? | Care Steps

Knowing how to clean and maintain an underwater camera correctly after every dive determines whether your gear lasts for years or fails on the next trip. Saltwater, sand, and pressure take a constant toll, but a simple post-dive routine keeps your housing, ports, and seals reliable dive after dive.

Why Every Dive Needs Immediate Rinsing

Saltwater is aggressively corrosive. When it dries on a camera housing, it leaves behind salt crystals that work into button shafts, O-ring grooves, and threaded ports. Those crystals grind seals, jam controls, and create microscopic gaps where water can enter on the next dive. Freshwater rinsing within minutes of leaving the water flushes the salt before it can crystallize.

If you cannot rinse immediately, keep the rig wet—spray it down or leave it in a shaded, damp bag—so salt does not dry onto surfaces. Canon recommends using a freshwater tank if one is available, soaking the entire setup to let trapped saltwater dilute out of O-ring grooves and around buttons where it hides.

How to Clean Your Underwater Camera Step by Step

The cleaning sequence matters—rinse before you wipe, soak before you open, and inspect before you store. These five steps cover every housing type, port, and accessory.

1. Rinse or soak in fresh water immediately. Dunk the camera and housing in a freshwater tank or rinse it under a gentle stream of fresh water. Avoid chemically softened or treated water—plain tap water or deionized water works best.
2. Work every button and dial while rinsing. With the camera off to prevent accidental changes, press each button, rotate each dial, and work every control at least five to ten times. This flushes salt and debris out of moving parts and past the seals.
3. Dry the housing thoroughly before opening. Use a clean, lint-free cloth to dry the entire exterior, focusing on seams, latch areas, and port rings. Opening a wet housing is one of the fastest ways to invite a leak.
4. Clean ports and lenses gently. Use a microfiber or soft lint-free cloth on glass ports. Acrylic ports need even more care—they scratch more easily. Never use abrasive materials, paper towels, or unapproved cleaning solutions on any port material.
5. Inspect O-rings, seals, and connection points. Check every O-ring for nicks, cuts, flattening, hair, sand, or lint. The sealing surface must be spotless before closing. Apply only a thin layer of silicone grease to O-rings—too much grease attracts grit instead of repelling it. Replace damaged O-rings rather than hoping they will seal.

If your housing design allows, remove the port and rinse it and its O-ring separately, since debris hides in port threads. For rigs with arms, lights, or accessories, disassemble those connection points periodically to prevent corrosion from building up where parts meet. Once everything is clean and dry, store the housing closed with a desiccant bag inside if it will not block any controls. Keep the housing out of direct sunlight to reduce the risk of internal fogging.

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Common Underwater Camera Care Mistakes

Most housing failures trace back to a handful of avoidable errors. Knowing them is the best prevention.

• Letting saltwater dry on the housing. Salt crystals form in button crevices and O-ring grooves, causing leaks on the next dive.
• Wiping before rinsing. Wiping a dry, salty housing grinds salt and sand into the port or lens, creating permanent scratches.
• Using soap, detergents, alcohol, or anti-fog spray on seals or optics. Fresh water only—chemicals degrade O-rings and damage optical coatings.
• Leaving the camera in a rinse tank. A soak is good, but abandoning it for hours lets sediment settle back onto the housing.
• Opening the housing while it is still wet. Water trapped in a latch recess or seam can drip inside the instant you break the seal.
• Over-lubricating O-rings. Excess grease attracts sand and lint, which then compromise the seal.
• Skipping yearly service. Manufacturers recommend annual O-ring and seal maintenance, or more often if you dive frequently.

As noted in Scuba Diving’s housing care guide, consistent rinsing and seal inspection are the foundation of reliable underwater camera performance dive after dive.