1. Stainless steel handles and other "hardware" of stainless steel can be scrubbed with brightener to increase the brightness.
2. The hinges, hanging wheels, casters and other movable parts of broken bridge aluminum doors and windows may reduce their performance due to the adhesion of dust during long-term movement. One or two drops of lubricating oil every six months can keep them running smoothly.
3. Special attention should be paid to the direction in which the handle is rotated and stretched, and no dead force should be used. In particular, teach children not to hang on the door handle and swing, which is prone to danger and may cause harm to the inner door.
4. When the rotation of the lock cylinder is not sensitive, scrape a small amount of black powder from the pencil lead and blow lightly into the lock hole. This is because the graphite component in between is a good solid lubricant. Avoid dripping lubricating oil, as it will make it easier for dust to adhere.