What should I do if there is fog inside a mechanical watch?

Hello everyone, this is Bokey. Today, I’m going to share some practical knowledge about the daily use of watches. When you’re wearing a watch and suddenly notice fog inside it, what could be the reason, and how should we clean it?

There are two situations when there is fog inside a watch: the first is that the watch has water ingress, and the second is that the watch has moisture ingress.

If the watch gets water ingress and it’s an emergency, you need to think about whether you didn’t lock the crown, or if you soaked it in water for too long, causing the watch to get water inside. If the amount of water ingress is relatively large, when you wear the watch on your hand, obvious fog will form. This is a normal physical phenomenon because when you wear the watch, the back cover becomes hot due to body temperature. In this case, it’s actually not recommended to handle it yourself, because non-professional operations may cause the watch to miss the best rescue time. For example, corrosion of the luminous parts, water stains on the dial – the cost of these components is not low, and some damages are irreversible. You should send it to professionals immediately to have it disassembled, cleaned and maintained. Don’t believe the rumors like putting it in a rice jar or using desiccants.

If it’s just a small amount of fog, especially for watches with average water resistance or those with aging waterproof gaskets, this can happen when you stay in an air-conditioned room for a long time and then go outside. The sudden temperature change from cold to hot can cause a little fog to form on the glass. In such cases, the fog can actually disappear on its own, and it’s not a major issue. If the fog persists for a short period, you can try pulling out the crown and leaving the watch in the sun for a while. However, it’s still advisable to have it disassembled to replace the waterproof gasket and enhance its water resistance.

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