你問的question即是一個表面 : 玻璃這smooth , 點解會污糟呢 ?!因為glass表面有高表面張力surface tension . 所以連水能wet glass . 一般空氣中的塵也可吸附於glass 面上 . 而detergent內有surfactants 即表面活牲劑 , 所以洗潔精水surface tension 是很低的 , 當抹到glass 上 , 令到上面污塵脫開走入洗潔精水 , rinse away , 而令到玻璃更清更乾淨 . This is the best I can explain about how dirts are removed by detergent . At lease you have college level to understanding why surface tension of a surface plays the role in cleaning .
There are many types of glass cleaners ,one for ship glass may contain vinegar + surfactants + alcohol . As the concentration of NaCl is much higher than on land . The slightly acidic glass cleaner can clean away the dirt & also remove salt deposit . There are some glass cleaners can clean & deposit a layer of low surface tension coating on the glass so water moist will not fog the glass .
2010-07-01 15:40:40 補充:
Sorry my Chinese writing machine not functioning well , hope you can understand .