If they are pissing all over it's because they are marking their territory. I'm not sure what the catch and release program is in your area, but the best thing to do would be to catch as many as you can with humane traps, bring them to a local vet that does C&R, have them neutered/spayed and then release them back into another area.
This stops them from breeding and adding more to the overpopulation, stops them from wanting to mark all over your property, relocates them and remains humane.
As far as smells go, they dislike citrus and vinegar so you could try putting tinfoil on the roof of your car (they hate that) and then coating it in those cents. If you have an outlet you could try a scat mat, its a tiny mat that "zaps" animals. Typically it's used for cats that jump on counters or dogs trying to get into certain doorways, but I think it could help your situation.
Either way, definitely look into a local catch and release program. The people that volunteer there will also be able to help you catch them and provide you with traps.
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Ashley
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