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Cascade dish washing detergent works good. Stick them in your dishwasher.
I can't speak for others, but I put my filters on the top rack of the dishwasher (by themselves) and about every 12-15 minutes I rotate them a quarter-turn. I do this monthly.
Can't imagine putting nasty hot tub filters in the machine that cleans my dishes. Ewww. It's not hard to rinse with hose and soak in a bucket. weird......
After wash and re-washing filters, what signs do you look for to say its time to throw it away and get new ones?