Wristwatch maintenance is an important aspect of keeping a watch in good working condition. Some basic steps that can be done to maintain a wristwatch include:

1. Keep it clean: Wipe the watch case, bracelet or strap, and glass with a soft, dry cloth to remove dirt and sweat.
2. Avoid extreme temperatures: Exposure to extreme temperatures can cause damage to the watch's seals, which can allow moisture and dust to enter the case.
3. Keep it dry: Avoid getting the watch wet as much as possible. If it does get wet, dry it off as soon as possible.
4. Be careful with magnets: Avoid exposing the watch to strong magnets as they can affect the accuracy of the timepiece.
5. Service Regularly: Have your watch serviced by a professional every few years to ensure that all the parts are functioning correctly.
6. Battery replacement: when needed.

It's worth noting that depending on the materials, movement and usage of the watch, the frequency of maintenance or service may vary. Also, some luxury watches that have complications or special features may require more specialized maintenance and care.