Throwing trash in public spaces comes will a lot of controversy and in U.S. the tourists gets most of the blame. In contrary, Tokyo the world’s largest metropolitan area manages to stay remarkably clean. There is NO trash thrown on the street of downtown Tokyo and that’s due in large part to how the city handles its waste. It's all about discipline, and their culture has great impact on education.
The Japanese don't throw trash on the ground even though the garbage bins don't exist (removed +30 yrs ago). Also, smoking was banned in several districts of Tokyo and special smoking places were designated around the city. It is very rare to come across a trash bin in Tokyo and there are no pockets loaded with trash. When I visited Tokyo, I always took a plastic bag with me for trash and used the garbage bin at the subway station.
Blame is counterproductive, let's learn something positive from another western country, cut down on waste and recycle everything that could become waste.
According to article below participants will be picked up by van twice a week and driven to specific sites where they will pick up trash, pull weeds and clear brush for five hours. All major metropolitan areas such as Boston, Chicago, DC, NYC, LA, Seattle should follow SD's initiative and extend their program to include anyone unemployed.
San Diego to pay homeless people $11.50 an hour to pick up trash
https://wsvn.com/news/us-world/san-diego-to-pay-homeless-people-11-50-an-hour-to-pick-up-trash/
Entrance to a downtown commercial building