I would not recommend twisting them off, they pop a lot easier that way. This is what I do:
Wait until they are big and not sooo deep green, this means they're about ready to pop anyway. Remove the rock, or whatever they're on, (if possible) Use your finger nail (easy for me mine are long) or something thin that you can get under the edge of the bubble and just pluck it off the rock. If you have to use force, then stop, its not ready yet and most likely you'll pop it. If you do pop it though, use a turkey baster and rinse that area of the rock.
HTH,
Brianna:rollface: