Fighting Cats!!! Need help plzzzzzz

Hello, 

Thanks for taking the time to read =)

The issue i am having is with 2 of my cats. they are both male cats and they are brothers from the same litter and have never been separated. Roughly 1.5 - 2 years old (born Jan 2011), one is the first born and the other was the second runt. They always got on never a problem until we moved house for the first time since they were born. They spend their days indoors at night and outside during the day or if they choose  to stay inside during the day (same as they would at the old house, nothing changed except the house). Anywho since we moved house they get really aggressive with one another from ripping fur off each other, meowing really loud, growling, snorting and carrying on and  attacking each other when ones a sleep, just can't be insight of one one another or it's on! and when trying to separate them by bare hands your hands would get bitten and scratch and they are still snorting.  I have gotten them desexed hoping that will help with this but so far no go, tell tale sign is they still growl at the sight of each other, so i get them out of each others sight!  I have had to keep them separated and also use a spray bottle of water to cut out bad behaviour. Any tips would be greatly appreciated to help them getting on again, it would be nice to have them together at the same time, instead of spending time with each cat on their own =(. There are no other cats that i have seen in the area i have moved too. I am also having the problem of one of them spraying ( it's disgusting) how do i stop that also? 

thanks for any help you may give me in advance! =D 

First make sure there are no health issues. One of them may not be well, causing the other to be more aggressive towards his brother. Second, it is possible that the former owners of your house had cats or other animals and your boys can still smell them. They can't find the "intruders" so they redirect their frustration on one another. 

By the way, when separating fighting cats, never pull them apart with your bare hands. Here's a link http://www.thecatsite.com/a/breaking-up-cat-fights

As an interim fix, you may want to get a Felliway diffuser.  My vet sells them and I've read about them here.  You may want to do a search for more information as I don't have first hand experience, but my understanding is that they put out a pheremone like scent that helps relax the kitties and make them feel like they're in an environment that has been pleasantly marked.

Just thought of something else - you may want to get a black light (hand-held - I think you can get them for around $20) and use it to find remnants of spray.  Then you can use a reputable enzyme-based spray like Anti-Icky Poo Spray or Nok Out that will break it down.  Otherwise, those marked areas will continue to be triggers.

Oh sorry, I guess Feliway only as one "l" !

Are there any cats around the new neighborhood they might have tangled with?  This happened with our cats--they got along great but then a new cat moved in the neighborhood and started really bullying our kitties.  We discovered the cat had been coming in our house while we were at work, fighting with our cats and eating their food!  Since our cats couldn't win the fights with the bully, they took out their frustration on each other and they had never fought each other before.

We had to get a different kind of cat door (SureFlap) that reads our cats' microchips but no other cats or other animals can get in. After awhile, the other cat realized it couldn't get in our house any more, gave up and went away. 

Once our cats felt safe and knew that cat wasn't around any more, they calmed down again.

...fighting cats can be dangerous so becareful. I'm a new cat owner, so my advice is very limited. I would talk to the vet about their "new personality, and new home". Alpha personalities towards siblings can be so sad, but this is how the act in the wild. Sounds like both are fighting for alpha rites, or leadership roles in new home. But still I would talk with vet