Khadka wax soo saarka guud wuxuu ka kooban yahay mid kumeel ah, mashiin daabacan, mashiinka dahaarka, iyo mashiinka goynta. Iyada oo loo marayo walaaqyo toos ah ama mashiinka ku dhex jira iyo mashiinka goynta, durbaanku wuxuu ku dhaawacaa dhumuc gaar ah si uu u soo saaro filim jilicsan oo PVC ah.