In some cities, including San Francisco, officials worry about the prohibition on washing streets and sidewalks. Public Works Department spokeswoman Rachel Gordon said that could interfere with the frequent cleaning of alleys to wash away human waste where there are high concentrations of homeless people.
During the past 12 months, she said the city responded to about 8,000 calls to steam clean streets of such waste.
During the past 12 months, she said the city responded to about 8,000 calls to steam clean streets of such waste.

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