I am in the middle of the same process right now. Using a big 15cc syringe and doing one ov vinegar and 1 of kalk grunge from the bottom of my bucket. They both work but not everytime...sometimes they just expel what you put in them. It seems you need to get it deep inside them or into the flesh. I use both because they should chemically cancell each other a bit. Repeat every 3 or 4 days so as not to nuke your tank too bad. You can also pull the rock out and power wash them off really good, LOL. Cleans the rock up really nice and then just put it back in the tank.
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