In a Japanese experiment it was found that businesses that made an effort to clean their fronts and the streets around it had higher sales than when it didn't clean up. Furthermore, the effect was even bigger if they could be seen doing it: in other words, do your cleaning at times people are passing by and see you doing it!
https://hell.twtr.plus/media/c48efa1559c99661104b4f17eca83b3fbe4dcf5f241a95b05637c792a9416248.file