It is actually possible to hose those cartridges down and clean them, but you have to pull them out sooner--I think you are waiting too long. The best thing to soak them is, surprising, electric dishwasher detergent. It doesn't suds up. Some owners of bigger cartridge filters always keep on in the solution and when it's time to swap just rinse it off. The other immediately goes into fresh detergent.
If you're still having cloudy water, you should push your FC up to 15ppm and keep it there until the water is clear. If you're REALLY desperate, you may invest in a Watertech Pool Blaster. It's a rechargeable vacuum that looks like a Dust Buster and attaches to a standard pole. It works as well as any vacuum I've used and I'm on my second. They run between $145-$200. Junk will go into the vacuum rather than the filter.
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