This is a new thing that has come to my attention. I've been on this earth for over 30 years and I've only ever cleaned a sofa if something has been spilt on it.
Apparently it is a regular part of some people's cleaning routines.
Do you? If so...... How? & How often?
Oh by the way I hoover it on a regular basis but not wash/clean the material. I don't fancy taking the covers off to put in the washing machine 🙈