Kev siv kom zoo thiab kev saib xyuas cov hniav tuaj yeem ua rau lawv lub neej ua haujlwm tau zoo, txhim kho kev ruaj ntseg thiab kev ua haujlwm ntawm cov tshuab ntim khoom. Nov yog qee qhov kev ceev faj rau kev tuav cov hniav:
1. Khaws cov hniav kom huv si thiab ntxuav lub ntsej muag ntawm cov hniav los ntawm cov roj thiab lwm yam impurities.
2. Tsis tu ncua lubricate cov hniav kom txo tau hnav thiab kev sib txhuam.
3. Ua tib zoo saib xyuas thiab hloov cov hniav kom tsis txhob hnav thiab tsim kua muag uas yuav cuam tshuam rau kev ua haujlwm ntawm lub tshuab ntim khoom.
