Amonia will not work as cat urine has an amonia scent to it.. White vinegar does work.. but there is a scent off that you can buy at pet stores that you dilute with water and spray the area.. It neutralizes the scent and it really works.. I feel for you but I also feel for these poor strays .. I have 3 cats and they never go outside.. They are all strays that we found and took in.. had them neutered and I keep them indoors at all times.. Much safer for them.. I am feeding several strays down here in Florida.. I feel so bad for them..Won't the Humane Society take them .. I went to the humane society in Ft Lauderdale, they have so many strays that have been brought in to them. They neuter them and put them up for adoption. Good luck with the situation.
Amonia will not work as cat urine has an amonia scent to it..
Using ammonia is actually a long-known trick for gardeners to keep cats & dogs out of gardens and flower beds. It certainly worked very well to keep the beasties off of my trash bags on garbage days. Now we live where they prefer cans, thankfully! 
You can clean-up or cover the cat urine smell, but that won't fix your problem. The stray cats will just keep coming back to remark the spot, or start marking a new spot. What you need to get is a dog for your yard. Cats don't dare come around when a dog is on watch. If you lived near by I would loan you my dogs. They take cat patroling very seriously. Ha! Ha!
cats hate the smell of amonia....I have heard if you soak cotton balls in amonia they won't go in that area. TO get rid of the smell, use bleach.
Maybe invest in a beebee gun LOL, just kidding so no one have a moo. =0) I do have a cousin that would have no problem using them as target practice though. 
I have also heard that bottled cougar pee might keep them away. You would of course have to pour it around your porch. Wait, maybe that is for deer...LOL
Sprinkler idea is hilarious but feral cats are just so different. These cats aren't just strays, they sound fully feral.
It surprises me that the local humane society won't do anything about them though, considering it's pretty inhumane to leave any creature outdoors to turn into some sort of crazed beast.. >.< I do not recommend shooting the cats though, since there ARE humane societies nearby. A lot of SHELTERS will charge for you to give cats to them but the Humane Society itself.. usually they're willing to take any animal but make it clear that they are not afraid to put animals to sleep.
Straight bleach eliminates the smell of cat urine, and baking soda also helps to neutralize odors. Something else I've heard of, don't know how you'd use it but it could work, are these anti-cat plug ins. They're supposed to work for certain areas of your house to keep the cat from going in but I suppose they could work outside if you could figure out how to get them to work. They emit a very high-pitched frequency that humans and most animals can't hear but cats can and it drives them crazy, they stay away. It won't harm the animals and won't create an eyesore in your entry way, but it may keep away those feral cats.
Lots of good ideas! I think I'm going to try them all one at a time, I don't want to hurt the cats but I'm just sick of this. I caught 2 cats on my kids play area platform getting busy yesterday. My kids saw it through the window and asked why they were hugging so funny 
I pounded on our glass door but they didn't care, just stared at me then while still finishing the act. I closed the blinds and then had to deal with questions from the wee ones 
I feel for you. My neighbors have loads of stray cat's. They spray all over my porch, including my door and the smell comes right into the house which has resulted in my cat's peeing on the carpet next to the door. They think my backyard is a litter box just for them!!! I'm constantly chasing them off my porch, out of my garage, and out of my backyard, which is fenced in, they just climb over. They do feed all of the cat's, but I think if you're going to keep them spay and nueter them.
I was getting so mad thinking about it that I forgot to add that my mom told me to put moth balls outside. It does help for awhile but they don't last long and that gets expensive.
Ugh I feel your pain! We have a cat hoarder across the street. When we lost our dog their cats decided to use my patio furniture as their resting spot. The first warm day I was cleaning off the furniture and there was dang cat hair everywhere! One of chairs smelled like pee too! I would love to get the kids a sandbox, but I just know it will attract those nasty cats.
A few weeks ago a kitten met us at our door and kept trying to get inside. I couldn't even get inside, because it was faster than me, lol. It was cold and I felt so bad, because my city has no animal control. The next day the painters came and every time they opened the door the kitten would run inside. My son is terrified of cats! So I finally put it into a box and sat it outside my door. Later that day when my husband came home I had to drive it 40 minutes to the nearest animal shelter. I am thinking about catching the others and taking them in too.
Well, tv stations want no part, says it's old news. 
Human society said we are full --sorry about your luck. 
Animal control said sorry - we can't help you. You have buy some cages to trap them all and bring them in to us, which is about an hour drive away.
We decide to try to catch them and take them to animal control, but I have to say this is not going to be easy! They are already trying to make loads of kittens 
http://www.waynesthisandthat.com/catwars2.htm
They have some of those scarecrow sprinklers for $69 on ebay.
I CANNOT STAND the smell of cat spray. I say invest in a dog, shotgun or antifreeze. I would honestly make a total pest of myself to animal control, put 'em on speed dial. I like the idea of using the water hose. Put one of those high pressure triggers on them and sit outside at night and hose 'em down. (Can you tell that I really hate that smell?) A neighbor and I used to have problems with moles (used to being key). We would sit outside at night and just wait to see the grass moving where they were burrowing a tunnel. A well placed flounder gig (yup, giant King Triton type pole because it existed) and an equally well placed shovel - moles were gone in a week.
We have someone in our neighborhood who is a cat collector. Last I heard she had close to 20 cats... some inside some outside. For years, we've been going for walks around the neighborhood, and for years you can smell the cat pee from one house before to one house after. It's disgusting.
The house that is behind them has been for sale for more than a year - nice house... cul-de-sac, big backyard, etc).... it is now priced lower than any other house in the area (150k... and similar houses in our neighborhood have been going for 250k - even WITH the housing slowdown), and it STILL hasn't sold because it smells so nasty in the backyard.
I think trapping is a good idea... but like others have said, I think you definitely need to try to get them to stop coming to your house (maybe block access from under the porch, etc).
We have 2 cats now... the third took a trip to our no kill/no time limit shelter after I had my first son. That cat decided that anything and everything that belonged to my son needed to be peed on. We put up with it for a year (I tried everything I could to help change this behavior - medication, treats, etc)... but it wouldn't stop. We finally had to rip out all of our carpets to get rid of the smell because nothing worked for us.
Our humane society has the $50 drop off fee too. It makes sense because it's to deter people from getting an animal and thinking they can easily get rid of it later. The humane society needs a way to offset costs. Unfortunately, it doesn't help teh good samaritan that finds a lost animal and wants to help or someone in your situation. Trapping them is probably your best bet if you can find a place to take them. You might also search and see if there is a TNR (trap, nueter, release) group in your area. It keeps the cats from breeding and exacerbating the situation. I am an animal lover and believe in humane treatment, but I have to admit if I were in this situation I don't think I'd be beyond killing the cats myself. It's obviously a health issue too, I wonder if the health deparment might do anything?
Getting rid of the smell is going to be hard. I've seen good suggestions already. Mostly it's going to be a lot of work cleaning.
I scrubbed with vinegar today that was just slightly deluted. A small section of my porch has been piddled on so much by the nasty fur balls that they rotted it out! I love animals but I myself am having a hard time not going out there and killing them. I looked into the spay/neuter - release program and there is not one anywhere remotely near us. The human society once again said no, don't bring them here. Once lady there said just to kill them because no one in our state will help you. Michigan law is that the cats are a free roming animal and can go on anyones property legally. How frustrating! I'm not giving up yet. This is WAR!!! I'm getting the sprayer as soon as I can!
Wow. Sam's Club carries something called Odo Ban in concentrated form--the stuff works wonders, even on pet stains. Meanwhile, even though I'm an animal lover I think I'd let my son shoot them as long as I wouldn't be breaking any township ordinances. Really, kinder to the cats in the long run.
Is there any way you can close off the entrances into the porch? If that's where they're hanging out, I'd guess that closing it off would keep them out. Of course, you'd have to get them out of there first and that could be difficult... I also like the idea of getting a big dog but then again, you'd have to take care of the dog and it also starts out as a puppy.
that motion sensor sprinkler seems like a great idea 
I know that cats totally hate water!
what a horrible mess you're having to deal with! 
We have less cats now then a few months ago. Some people have taken matters into their own hands and I hate to think what has happend. My DH and I were just chasing them with water hoses, the big ol' water sprinkler of extreme pressure has helped too. We still have a few so I'm sure next year there will be more.
The people next door got a big ol Rotweiler dog and a few cats have met him and have not been seen again. Ever since the dog the cat population has went down. The ones that are smart enough not to venure off into their yard though are still around.
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