What type of filter are you wanting to clean? Is it a cartridge filter for your spa or is it the filter for your pool? For cleaning a cartridge filter, we recommend using dishwasher soap or trisodium phosphate (TSP). Below is a link to a thread describing that process.
Filter cartridges are best cleaned by hand with a hose. I don't think that you would accomplish much by putting it in the dishwasher and you might even damage it. Let it soak for a while in water with TSP or dishwasher detergent and then take it out and hose it out real well.
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