I need to "get rid of" a cat

[Grip72]

yes..this family somewhere in the section of the townhouses/condos that i live in own a few cats..and bad cats..they poop all over my deck and walkway. They climb onto my CAR and slide off it, leaving muddy paw prints and scratches and sometimes when i leave the door open to cool off, they even come into my house with there muddy paws...i don't know who's cats they are and they are always roaming around...hence, i want to harm them..any suggestions you have would be great

p.s. this sounds really bad, but i'm freakin mad and i don't want a $35 animal ruining my paintjob and carbon fiber hood!!!

p.s.ss i don';t actually want to kill it, as so much as get rid of it!