I don’t think people in HK nowadays got 痰罐! In 2019, their children are already 9 & 12 years old, I don’t think they still have potty at home! And use the 痰罐 to cover the head till the next day is so unreasonable!!
I can understand what you're saying, but I feel it odd that someone of such Eng level doesn't stick to his/her own language for dropping comment under a Cantonese channel:- ~ the room "doesn't", not "dont"; ~ "an" ancient room, not "a" ancient room; ~ "Maybe", not "May be" ...