How do you like to clean your air stones?

I have about 10 of these
Ecoplus Large Round Air Stone

Warm water, dish soap and some bleach. Give em a scrub with a toothbrush and let them soak for bit. A thorough rinse and then just try to blow through them with..put the nipple in your mouth and blow..lol. Seriously though, you'll be able to tell which ones are still plugged.