1, mushure mekushandiswa kwesimbi inomera inofanira kuiswa pasherufu yakatsaurirwa, yakachengetwa mufekitari inofefetera, yakaoma, yakachena, nekuchengetwa nemaoko.

2, iyo yepamusoro inofanira kugara ine ngura yekudzivirira, isingabvumirwe muasidhi, alkali, munyu, magasi emakemikari uye kuchengetedza mwando.

3, inorambidzwa munzvimbo yakakwirira yekushisa nzvimbo yekuchengetedza.

4, gara uchichenesa zvikamu zvinotenderera, mafuta enguva dzose, kudzivirira kukakavara kwakaoma, jamming phenomenon.