Some zinc alloys and copper locks will have a long spot when used for a long time. Don't think that this is rust. In fact, it is oxidation. Just use a surface spray to wipe the spot.

When the lock is used for a long time and the lock cylinder is not flexible enough, a small amount of black powder can be scraped from the pencil lead and lightly blown into the lock hole. This is because the graphite component is a good solid lubricant. Never drop in the oil as it will make it easier to stick to the dust.

The part where the lock body rotates should always have a lubricant to keep it rotating smoothly. At the same time, it is recommended to check whether the fastening screws are loose for a half year period to ensure the fastening.

The lock can not be exposed to rain for a long time, otherwise the small spring inside the lock will rust and become inflexible. The rainwater that falls will contain nitric acid and nitrate, which will also corrode the lock. Turn the key to open the door lock, and do not pull the key to open the door without returning to the original position.

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