Easy solution here. Just paint brown the sidewalks. Problem solved.
As a bonus, will look very nice with the white streets.
"He warned that once fecal matter dries, it can become airborne, releasing potentially dangerous viruses, such as the rotavirus. “If you happen to inhale that, it can also go into your intestine,” he said." "“The contamination is … much greater than communities in Brazil or Kenya or India,” he said."
https://www.nbcbayarea.com/news/local/Diseased-Streets-472430013.html