Shanghai!
They are amazing...
They come in their masses, they line up on the jetway in single file, one behind the other, like an army of tiny little 5ft robots. They all wear identical matching boiler suits and face masks, each with a hoover strapped to their back.
They wait in absolute silence for the last pax to disembark. Then when they get the nod they scurry onboard with no time wasted, each knowing exactly where they are to go, and what they are to do. They work hard, and are done in minutes. The aircraft looks literally brand new!
And then you get back to Heathrow, where you are greeted by a mass heard of dirty sweaty, smelly cleaners, all wearing whatever they feel like, all chewing gum and swearing and laughing loudly. Its amazing what different cultures present you with!