Cov kev ua tau zoo ntawm kev haus cawv cawv tau hauv qab no:
1. Cov tsos ntawm tuscawv txiv hmab swabsyuav tsum huv, tsis muaj teeb meem me me, thiab tsis muaj qhov tsis xws luag xws li impurities, stains, thiab mildew.
2. Covcawv txiv hmab swabsyuav tsum tau noo, thiab haus dej cawv tuaj yeem pom kev so los ntawm nyem nws nrog koj cov ntiv tes.
3. Cov concentration ntawm cov cawv kho mob siv los uacawv txiv hmab swabsyog 70% rau 75%.
