Is there some way to pay the homeless people to clean up the city? I am thinking of something like a smartphone app that logs which blocks you spend time on.

Is there some way to pay the homeless people to clean up the city? I am thinking of something like a smartphone app that logs which blocks you spend time on. If you spend time on a block and it's cleanliness improves you get money. This idea does have some problems regarding minimum wage laws and funding but the concept could be worth a try at least.