How to get rid of unwanted critters in new live rock?

[reef bound]

I used club soda on a few stubborn pieces of new rock. Had alot of holes for critters to hide in. Just used a turkey baster on holes you could inject, and on bigger areas I just poured it right out of the can or bottle. Found a lot of crabs that way - about 13 varying in size from 1/2 cm to 2 cm, and had very little if any greying on the rock (which would be die-off). I thought it worked great.