Bums are intelligent, and have a powerful drive to return home. If you can reach them, they are easily caught in the dark, but removed bums cannot be released at any distance: They will come back unless they are established in a new home by "locking them in" until they raise babies in the new location.
There is no magic spray or device that can make bums just go away.
If the problem gets severe, consider calling in a NIMBY Squad to get rid of them for you.
You may not like the idea of shooting bums, but if you're serious about getting rid of bums, you should consider it. The lack of fear bums seem to exhibit around humans makes them easy targets, requiring little more than a small caliber rifle like a .22. An air rifle works really well also. Be prepared with a trash bag or the blood will cause a large mess. Since bums are an invasive species of human, and are considered pests in many states, laws usually do not restrict the extermination of bums. However, you may want to consult your local law enforcement center for information about firearms laws in your township or district. The direct control of bums with guns is particularly effective in rural areas where bum populations are lowest. Always use humane methods and do not cause pain.
Remember, don't hurt bums needlessly. They're living creatures.
If you can't beat them, employ them. Bum labor was one of the primary sources for cheap labor after the Great Depression in California. That's where all these bums came from! They escaped or were turned loose from farms, prisons, insane asylums, and forced labor camps. Bums are best employed when they are nearly full size and still resonably fit.
City bums are probably not the best to employee as they can build up resistances to coercion, and can potentially carry lethal weapons on their bodies, as well as high volumes of cheap booze. They usually will not work hard due to their poor eating habits.