Clean the case and metal bracelet with a toothbrush and soapy water. Use a mild detergent. After swimming in the sea, always rinse your watch with fresh lukewarm water. If the watch has a rotating bezel, turn it several times while rinsing it. This will prevent salt build up in the bezel and also prevent corrosion. Always dry your Oris with a soft cloth. Ultrasonic cleaning can be used for metal bracelets but is not recommended for watch heads as gaskets may get damaged, adversely affecting the water resistance of your Oris.