Thaum xaiv ib lub ntsej muag cleanser, nws yog ib qho tseem ceeb los xav txog koj hom tawv nqaij. Qib pH zoo tshaj plaws yog nyob nruab nrab ntawm 5.5 thiab 6.5, zoo ib yam li cov tawv nqaij noj qab haus huv lipid barrier. Xav txog cov qauv siv feem ntau siv cov amino acid surfactants, thiab xyuas tias thawj ob peb cov khoom xyaw qhia meej meej cov amino acid surfactants. Tsis txhob siv cov tshuaj ntxuav hnyav xws li xab npum- cov tshuaj ntxuav tes thiab SLS/SLES. Xa mus rau thib peb-cov ntaub ntawv ntsuam xyuas tog, ua tib zoo saib xyuas lub zog thiab kev ua siab mos siab muag.
Cov tawv nqaij oily tau txais txiaj ntsig los ntawm cov roj- tswj cov khoom lag luam, xws li xab npum- cov tshuaj ntxuav tes uas muaj zog ua kom huv, tab sis zam dhau - ntxuav. Cov tawv nqaij qhuav yuav tsum siv cov khoom uas tsis yog-foaming lossis micro-foaming, xws li non-foaming lossis emulsified cleansers. Cov tawv nqaij rhiab heev raug pom zoo rau kev kho, xaiv cov tshuaj tua kab mob maj mam thiab tshuaj xyuas cov khoom siv moisturizing thiab kho cov khoom xyaw. Kev sib xyaw ntawm daim tawv nqaij xav tau kev saib xyuas tawv nqaij. Rau oily, pob txuv- ntawm daim tawv nqaij, thaum ua kom huv si maj mam, koj tuaj yeem xaiv cov khoom uas muaj cov tshuaj pov thawj pov thawj cov roj- tswj thiab pob txuv- tawm tsam cov khoom xyaw (xws li salicylic acid, zinc PCA, thiab matrine), thiab nruj me ntsis kom tsis txhob khaus khaus.