I recently got a Cobalt 2 from a friend who had to quit diving. My problem is that there is some sand up inside the high pressure quick disconnect. Is there a safe way to get it out? I lightly tapped and used a small plastic straw to get most of it out but I am sure that there is still some up inside of it. Can I flush it with some alcohol or water? Also, is there a way to clear all of the dives from it?