In particular, the door hinges, sliding doors and curtain rails should be opened and closed smoothly. Squeaking affects rest and feng shui. When installing, apply grease to prevent rust and lubrication, without abnormal sound. Otherwise, rust, abnormal noise and poor sliding will begin in a few months. Start over, and it will be unrecognizable in a few months.
It is best to use fully synthetic lubricating silicone grease with food-grade safety certification. You can use tiger bees or Krupp. Colorless and transparent, low temperature resistant, water resistant, frost resistant, odorless and durable. Taobao has a toothpaste-like package of130g, which is convenient to use. Don't use cheap butter or engine oil, it stinks.