Lub qhov muag tsis pom kev yog feem ntau tshwm sim los ntawm kev sib sau ntawm cov kab mob ntawm cov iav thaum lub sij hawm, ua rau tsim cov yeeb yaj kiab oily. Cov yeeb yaj kiab no feem ntau tshwm sim los ntawm cov pa phem hauv tsheb, roj thiab roj paug, nrog rau cov khoom ib puag ncig xws li tsob ntoo kua txiv thiab cov noog poob.
Cov pa phem uas tsim los ntawm kev ua tsis tiav ntawm lub tsheb tso pa maj mam tso rau ntawm lub qhov muag. Qhov chaw nres tsheb hauv thaj chaw uas muaj roj hnyav thiab cov pa luam yeeb tuaj yeem ua rau muaj cov yeeb yaj kiab oily. Tsis tas li ntawd, cov tsheb nres nyob rau hauv cov ntoo yog feem ntau cuam tshuam los ntawm tsob ntoo kua txiv thiab cov noog poob, uas txo cov pob tshab ntawm lub qhov cua thiab ua rau muaj kev tsim cov yeeb yaj kiab oily.
Txhawm rau tiv thaiv kev sib sau ntau dhau ntawm cov yeeb yaj kiab oily los ntawm impairing visibility, nws yog ib qho tseem ceeb los ntxuav lub tsheb qhov chaw tsis tu ncua. Cov neeg tsav tsheb yuav tsum tau xyuam xim rau qhov tsis pom kev ntawm lub qhov cua thaum lub sij hawm tsav tsheb txhua hnub thiab ua kev tu kom sai. Yog tias pom muaj thaj tsam loj ntawm cov yeeb yaj kiab oily, siv cov kws tshaj lij tsheb oily film cleaner lossis nrhiav kev pab los ntawm lub khw nthuav dav tsheb yog pom zoo.
Rau cov tsheb uas nres rau lub sijhawm ntev, nws raug nquahu kom xaiv qhov chaw nres tsheb kom zoo thiab xav txog kev siv cov npog tiv thaiv kom tsis txhob muaj cov yeeb yaj kiab oily. Ua kom lub qhov cua kom huv si yog qhov tseem ceeb rau kev tsav tsheb nyab xeeb.
