Txawm hais tias txau cov tshuaj tsw qab rau ntawm cov khaub ncaws, nws zoo li ua rau tus ntxhiab tsw ntev, tab sis nws yuav ua rau cov khaub ncaws muaj qhov teeb meem ntawm staining lossis discoloration vim yog xim, cawv lossis roj tseem ceeb ntawm cov naj hoom.
Japanese khaub ncaws saib xyuas hom No.1 tsim ib hom khaub ncaws ntxhiab, uas muaj cov thev naus laus zis tshwj xeeb ntawm "xauv cov tshuaj tsw qab tshuaj tsw qab", cov tshuaj tsw qab tuaj yeem tawm los ntawm kev sib txhuam, Khaws cov khaub ncaws ntev
12 lub lim tiam ntawm cov tshuaj tsw qab tshiab.
