There’s an ad on TV that goes “We all know carpets should be cleaned once a year, don’t we?”
It appeals to the Emperor’s New Clothes psychological trait where everyone’s scared of being the stupidest person in the room. You must be a retard if you don’t know what everyone else knows about carpet cleaning. You must be a slovenly retard.
I’ve never had a carpet cleaned in my life. By the way, if you live in NSW, it’s illegal for a real estate agent to demand that you dry clean the carpet. Not many people know this and almost all agents put the demand in their tenancy agreements. Such clauses are void.