What a timely question!! You freaked me out to because I don't wash walls on a regular basis!
However, I've gone through a getting rid of carpet to porcelain tile wood in 3 rooms to complete downstairs with no carpet this week.
As I noticed my furniture moved out, I noticed exactly where my dogs slept per the wall.
Mostly, my wall cleaning was spot cleaning and patch painting when needed for fingerprints and such.
Now with my new bedroom, I need to wash my walls!! Just more to do with this project but since you mentioned it... every spot sticks out like a sore thumb to me.
Thank you... I'm adding this to my list since we just wrapped up the floors today. It will not be a routine job though!