1. Stainless steel handle and other stainless steel "hardware" can be wiped with brightener to add brightness.
2. The performance of movable parts such as hinges, lifting wheels and castors may be reduced due to the adhesion of dust during long-term movement. One or two drops of lubricating oil can keep them smooth every half a year.
3. Pay special attention to the rotation and stretching direction of the handle, and avoid using dead force. In particular, children should be educated not to hang and swing on the door handle, which is prone to danger and may cause damage to the inner door.
4. When the rotation of the lock cylinder of the Aluminium wood windows is not flexible enough, a small amount of black powder can be scraped from the pencil lead and gently blown into the lock hole. This is because the graphite component is a good solid lubricant. Do not drip lubricating oil, because it will be easier to adhere to dust.

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