Funny, but in countries like India, it is fairly common to have a guy come in and wash your car every morning. Put another way: a subscription service for car wash. In countries like India, it is inexpensive enough and there is enough pollution to call for a daily car wash.
In the US, I can see my Dad signing up for a weekly car wash at our suburb home.
Not as funny as you might think -- if you own a car in India, you're probably upper class. In India, lots of paid inane chores are common, like carrying one's luggage from the taxi to the airport, even if it's a small backpack.
Aside from kahawe's excellent comment, one doesn't necessarily need figures here. Can't I be a primary source for this? I think anyone who has visited india/china can probably tell you that car owners are definitely upper class.
This also holds true across other Asian countries - car ownership is common only in upper-middle class and really rich families; and for very rich Chinese families the really expensive part is the license plate and not the car... no 4s and the more 8s and 9s, the more expensive the plate.
In the US, I can see my Dad signing up for a weekly car wash at our suburb home.