Not sure about what you are trying to say here. But yes they did.
During the 1918-19 “Spanish” Flu pandemic many jurisdictions made it mandatory to wear masks, some people were even arrested for not doing so. Although in truth, those gauze masks likely did little good as they allowed the virus to pass through. They knew what influenza was but had never seen one like this before. And while there had been many advances in medicine including several vaccines and improved microscopes, those microscopes were not powerful enough to see viruses and the vaccine that was developed was for what they thought caused it was against a bacteria and so was useless, but they did the best they could with what they knew at the time.
In many places, in both large cites and smaller towns, schools, restaurants, bars and theaters and even churches were ordered closed, the size of public gatherings were limited and factories were either asked or mandated to stagger shifts so as to limit the number of people working together at any one time. Train and streetcar operators were mandated to keep their windows open at all times to keep fresh air circulating. And some businesses like barber shops could stay open but only if they moved their operations to the sidewalk.
Not sure about hand washing but posters were put up reminding people not to spit in public.
https://www.history.com/news/spanish-flu-pandemic-response-cities
