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　　（1） You can use a whitening agent to scrub stainless steel handles and other stainless steel industrial door accessories to increase brightness.

　　（2） Pay special attention to the direction of rotation and extension of the handle to avoid exerting force. It is particularly important to teach children not to hang on the door handle and shake it, as it is prone to danger and may damage the inner door. Once the lock is broken, the house is basically unguarded, posing a significant security risk!

　　（3） Long term movement of movable components such as hinges, suspension wheels, and casters may reduce their functionality due to dust adhesion. Adding one or two drops of lubricating oil every six months can keep them smooth.

　　（4） When the lock cylinder is not sensitive enough, scrape a small amount of black powder from the pencil lead and gently blow it into the keyhole. This is because graphite composition is an excellent solid lubricant. Do not let lubricating oil drip into it, as it will more easily stick to dust.