Having seen your pictures of the spraying I have to say how much I admire your patience. I'd be at my wits end by now, it's so nice of you to remain calm and collected when faced with this moat of pee.
A few things that come to mind. (Not actual solutions, just things that might alleviate the situation a little)
You mentioned that you use bleach to clean with. This masks the smell of urine, but as bleach contains ammonia to cats it smells as if another cat has sprayed there. You could try cleaning with an enzyme cleaner, which breaks down the components of cat pee and neutralizes the smell. I've heard Nature's Miracle is a good one. I use Fizzion, which also works well.
A few of my boys had a power struggle last year. It took a while to calm things down and get them to stop spraying, but one thing that made it easier to clean and reduced the spraying was baking (aluminum or tin) foil. Cats don't like to walk on it and if they spray it they get splashed with their own pee. Not suitable for every surface, but maybe try taping some sheets of tin foil up in places that get hit a lit and see if it makes a difference.
I'm with you on Felliway-is-too-expensive. I used it when we first moved the colony two years ago and it did seem to help. However the diffuser start to smell like melting plastic after a couple of uses and the refills are only available as expensive imports. These days I use an oil burner with lavender oil. I'm not sure if this actually calms the cats down or not, but it makes the house smell nice and I've heard that fleas don't like lavender. I don't use it directly on the cats, I just have an oil burner in one room so that the smell of lavender can waft around the house.
Maybe some of these idea would help?
I can see a little black critter on the pavement and something tabby with huge eyes up against the fence. What is that? Time to call Monster Quest?
A few things that come to mind. (Not actual solutions, just things that might alleviate the situation a little)
You mentioned that you use bleach to clean with. This masks the smell of urine, but as bleach contains ammonia to cats it smells as if another cat has sprayed there. You could try cleaning with an enzyme cleaner, which breaks down the components of cat pee and neutralizes the smell. I've heard Nature's Miracle is a good one. I use Fizzion, which also works well.
A few of my boys had a power struggle last year. It took a while to calm things down and get them to stop spraying, but one thing that made it easier to clean and reduced the spraying was baking (aluminum or tin) foil. Cats don't like to walk on it and if they spray it they get splashed with their own pee. Not suitable for every surface, but maybe try taping some sheets of tin foil up in places that get hit a lit and see if it makes a difference.
I'm with you on Felliway-is-too-expensive. I used it when we first moved the colony two years ago and it did seem to help. However the diffuser start to smell like melting plastic after a couple of uses and the refills are only available as expensive imports. These days I use an oil burner with lavender oil. I'm not sure if this actually calms the cats down or not, but it makes the house smell nice and I've heard that fleas don't like lavender. I don't use it directly on the cats, I just have an oil burner in one room so that the smell of lavender can waft around the house.
Maybe some of these idea would help?
I can see a little black critter on the pavement and something tabby with huge eyes up against the fence. What is that? Time to call Monster Quest?
