It is difficult to open the lock of the corridor in the community. How to break it so that you can open it without a key?

A common problem. The hinge lacks rust-proof lubrication, and the switch is laborious, which affects the appearance and makes a squeak, which affects the rest.

Well-known hinge brands such as Macalline use the hinge grease of Hutou hotolube or Krupp, which is colorless and transparent, with good adhesion and durability. Leopard has a tube package of130g, which is also suitable for sliding doors and slideways. Apply grease directly to the hinge gap, and the grease will slowly penetrate into the hinge. The maintenance period is four to six months.

Don't use lubricating oil or ordinary butter, it is easy to lose or freeze at low temperature, and it will also volatilize harmful odor. Vegetable oil will soon go rancid, produce peculiar smell and lose its lubricating effect.