go to your local shelter and pick up a slew of brochures that explain "Why your cat is healthier nuetered" (and the such) then put them in their mailboxes in the middle of the night. Or, get a tomahawk and trap and nueter yourself and have the bill sent to them! You can bet that as many males spraying around your area, there are an equal amount of females being impregnated by them!! Watch for mothers and get them and their kittens to shelters before kittens are feral! Toms do live healthier, longer lives if nuetered, the owners may not know that or just don't want to pay for it- a local rescue group (ask your vet for phone #s) can nueter them for 1/3 of the normal cost- info you can give the owners! (unless they think they're is nothing wrong with what they are doing in which case sneakiness is your only choice). There is nothing that will get rid of that odor. Period. Products just mask it.