有關toiletcleaner,ovencleaner...

Toilet cleaner: HCl/H2SO4 (according to my observation on most of the toilet cleaners) (但一般都係接受H2SO4多過HCl)

Drainage pipe cleaner, oven cleaner: NaOH

Glass cleaner: NH3(aq)

Here are some of the explanations in Chinese:-

喺cert level，一切甚麼surfactant等等深奧名詞其實唔使記
唔使諗得咁複雜
答裏面主要有咩chemical就得
並不需要記佢地屬於咩類型(surfactant，界面活性劑，就係其中一個類型)

Drainage pipe cleaner咪即係通渠水
你試下隨便買支通渠水番黎
佢應該會寫裏面既active ingredient係咩，果個就係sodium hydroxide
而呢個亦係你所講既major component
通一次渠其實係需要大量既sodium hydroxide去溶解渠裏面既頑固油漬，將佢轉做類似detergent既野，夾埋夾埋都有成廿幾三十克，而大約半支通渠水已經畀到個咁既份量
一支通渠水裏面既液體其實唔多，但係半支都已經畀到咁多sodium hydroxide，可以想像一支通渠水係有幾多sodium hydroxide

Toilet cleaner通常主要含有強酸
你可以睇下街上面買果d潔廁得果類攞黎洗馬桶既清潔劑
有d有HCl，有d有NaHSO4(係一隻帶強酸性既acid salt)，有d有H2SO4
通常HKEAA會接受你寫H2SO4多d

Glass cleaner之所以靠ammonia做主要成份
其實係預左你會直接手執毛巾，喺噴左野之後直接抹玻璃
如果用sodium hydroxide做主要成份，係會整傷隻手
所以先用個溫和d既ammonia，貪佢溫和得黎又可以溶解油漬污漬

Oven cleaner其實大多數都係噴裝
一般噴出黎都係好少液體
但係爐頭係有好多油漬
呢d液體必需要有大量sodium hydroxide先有溶解油漬既功效
所以佢個major component就係sodium hydroxide，而且佔既成份係極高

The major ingradients for most cleaners are the surfactants . Since the soil(dirts) sticks on the surfaces firmly , you need some substances to wet the dirts , penetrate to the interface betweem the dirts & the substance , loosen them up & etc . NaOH or ammonia is the alkaline builders for removing dirts which are acid in nature , they are also ingradeint of cleaners & work together to clean the dirts . Cleaning is a sceince not just as simple as sweeping the floor . It involves physical & chemical actions . For deeper explanation , you need college education so I better stop here .