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　　1. Some zinc alloy and copper locks will have “spots” when used for a long time. Don't think it's rust, but it's actually oxidation. Just spray the surface with wax to remove the spots.
　　2. The lock has been in use for a long time, and the key may not be inserted or removed smoothly. At this point, just apply a little graphite or pencil powder to ensure smooth insertion and removal of the key.
　　3. The rotating parts of the lock body should be regularly lubricated to ensure smooth rotation. It is also recommended to check the fastening screws for looseness every six months to ensure tightness.
　　4. Locks should not be exposed to rainwater for a long time, otherwise the small springs inside the lock will rust and become inflexible. The falling rainwater contains nitric acid and nitrate, which can also corrode the lock.
　　5. Turn the key to open the door lock, and do not pull the key directly to open the door without the lock core returning to its original position.