I had the same problem here. I tried just about everything. It is the males that are coming around spraying and marking their territory. They do this even more when females are around.
The trick here is, don't disrupt the population by catching the cats and taking them away / killing them. That will just leave an opening for other cats to come in and take their place.
The only way I fixed my problem was to buy a cheap cat trap and set it out. After a few days I caught a male cat.
Once you catch a cat (but do this for any cat), find a pet shelter / animal sanctuary that will spay / neuter them. Most do it for free but some cost like $30 bucks or so for each cat.
Once you get them fixed, just let them go right back where you caught them.
They will still run shit around your area and keep other cats away but they will not bother spraying as much (if any) because the hormonal drive will be removed.
Fixing the females would help control the local population so that other new cats (babies) don't start hanging around.
My problem was fixed once I caught and fixed 2 males.
It's a pain in the ass to have to do that but once it's done it's done.
Trust me, I tried everything... mothballs, coyote pellets, motion activated water nozzles, all that shit. This was the only thing that worked.
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