How to keep cats off your property?

So the neighbor a few houses down, the one who's cat kept scratching my car jumping up on it until I got a car cover ($220) just adopted FIVE more cats and I assume they are all from the same litter as they look like identical tabbies in size and coat.  

They are well fed and wear ID collars and all, but problem is that they are outdoor all day except at night, and they almost always without exception end up in my back yard.    It makes Wesley and Buttercup a little spazy trying to defend their turf from the cats staring in the house from behind the glass.  

I've gone out and banged a big soup spoon on the bottom of a pot I had out but they still come back.   Most likely its because I have two bird feeders and a bird bath in the yard which I don't think anyone else in the neighborhood has so there are always tons of birds in my yard.  

Ideas short of a super soaker?   I know to get rid of the deer eating the plants at my mom's house we got some deer repellant that works.   Only concern with a predator scent or something is that occasionally we have the windows open when its nice, and I'd hate to cause a panic in Wesley and Buttercup from the smell.

Have you tried spreading used cat litter around your property's boundary? Although I've never tried it (since my cats go outside) a friend of mine has done it with good results. 

Its made of high protein wheat (Swheat Scoop), so I'm afraid that might attract ants and what not....  I heard of spreading mothballs, but I have to be sure that cats and birds both would not ever be interested in eating them since it'd surely be poisonous.  

Ducman69 said:

Its made of high protein wheat (Swheat Scoop), so I'm afraid that might attract ants and what not....  I heard of spreading mothballs, but I have to be sure that cats and birds both would not ever be interested in eating them since it'd surely be poisonous.  

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I doubt ants would eat poop covered in litter or urine soaked wheat.

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Minka said:

I doubt ants would eat poop covered in litter or urine soaked wheat.

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I understood it to mean used litter, but not the actual pee/poo.   If the idea was to throw urine balls and feces in my flower garden... I don't think so!  Might not smell quite as wonderful!  

Actually, Minka understood what I meant. Yes, by used, I mean peed and pooed cat litter. It does not mean you have to do it for the rest of your life, but after a week or so, the outsiders will respect your backyard as Wesley and Buttercup's territory and may stay off it. 

We tried the Mothballs to keep the cats out of our flower bed. It was a no go for us. They still keep using our flower bed as a litter box, so when it is warm we can't have the windows open due to the smell. The mothballs also affect my asthma and I can't deal with it. best of luck if you find a cure to the problem let me know.... lol 

StaciaS said:

We tried the Mothballs to keep the cats out of our flower bed. It was a no go for us. They still keep using our flower bed as a litter box, so when it is warm we can't have the windows open due to the smell. The mothballs also affect my asthma and I can't deal with it. best of luck if you find a cure to the problem let me know.... lol 

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Oh, I didn't even think of that, the mothballs may smell even stronger than kitty poo/pee.  Well, we can definitely strike that off the list.   Think I'll just be mean and use a squirt gun, heh.    As long as I aim for their butts and not their head, they should be fine as its 70oF out in the shade still so not like they'd freeze.