There's loads of discussion on various websites about car cleaning, how often, what products etc etc. For all that, the average person does not clean their car that often. I saw one figure of 9 times a year and at least half of these would have been at automatic car washes or commercial handwashes.
I blame my Dad. He had a company Jag as the sales director of an industrial lighting company. It was important to him to be smartly turned out and to arrive in a clean car. I earned extra pocket money by cleaning the car once a week. I even did my uncle's Vauxhall Cresta so a nice little earner.
It bothers me if the car isn't clean, it shouldn't but it does.