I am hoping someone can show me different for their rural areas ... but it appears that because of the price of real estate .... self service car washes are not that numerous in Japan. Lots of automated ones though (https://www.city-cost.com/blogs/City-Cost/MqBAz-money_transportation).
I recall a coin operated car wash trash can being advertised years ago. I thought it was silly, then, but I'd probably buy some now! Does anyone remember those, or have them?
I agree that it's silly, but I also think it might make people realize that trash is not free, and the car wash is not a trash dump. I have had good luck with my local police departments tracking down people who have left bulk trash.