I have a few spiral drills that are 3.3 mm diameter and have 2 tiny holes that are supposed to allow coolant to flow through the tool. Unfortunately they got clogged with chips of aluminum. I was wondering if there was a way to dissolve the aluminum out of the holes. I was told muriatic acid would work but over here we're machinists, not chemists, so I wouldn't know. Any help in saving these 200 dollar tools would be much appreciated.