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1x to 2x monthly in San Francisco. Somewhat notoriously tied to parking limitations in the city.

I visited Barcelona 15 years ago, they cleaned the streets every morning.

that's kind of what i'd expect to be necessary for any big city - which atlanta definitely qualifies as to me.

Is this a normal thing or just in cities where tourists are likely to visit?

Monthly in Chicago. Between apr-oct. Frequency needed probably depends on how many trees you have

Weekly or twice a month (depending on the season) for all streets and sidewalks here.

Daily in Hong Kong

Weekly where I am.