Mchenga wopaka utoto nthawi zambiri sufota ukaugwiritsa ntchito. Mchenga wamitundu nthawi zambiri umapakidwa utoto kuti ukhale wofanana komanso wokhalitsa. Komabe, kulimba kwa mchenga wamitundu kumakhudzidwabe ndi zinthu zina, monga kukangana, chinyezi, kuwala kwa ultraviolet, ndi zina zotero. mchenga kuzimiririka pang'onopang'ono. Choncho, ngati mumagwiritsa ntchito mchenga wamitundu panja kapena pamalo omwe nthawi zambiri mumakhala madzi, mungafunikire kuyang'ana ndi kudzaza mchenga wamitundu nthawi zonse kuti mtunduwo ukhale wowala.