1. Lub zog loj thiab lub teeb yuag;
2. Muaj zog corrosion kuj thiab ruaj khov;
3. Zoo nkauj tsos thiab glossy nto;
4. Tsis txhob sau av, nag, daus, lossis dej; tus kheej- ntxuav thiab tswj tau yooj yim;
5. Qhov cua zoo, teeb pom kev zoo, cua sov dissipation, plam tsis kam, thiab tawg- cov khoom pov thawj;
6. Yooj yim rau nruab thiab disassemble.
