We want you to enjoy your Eterna for years to come, and therefore recommend that you take good care of it: our watches are fine precision instruments exposed to exceptional stresses. We therefore recommend that you have your watch subjected to a through cleaning and service by an Eterna specialist every four years. Meanwhile, to ensure it continues to runs as it should, your watch should also be checked and lubricated annually: regular cleaning with a soft brush and lukewarm water preserves the brilliance and overall appearence of the high-quality materials used in your Eterna watch. Note that after swimming in the salty water of the sea, it should be rinced under a tap.