Hello! I have not brewed in a number of years now, but am eager to get back into the hobby. I have been getting my equipment ready and cleaned up in preparation for a comeback brew, but I am concerned with my counterflow chiller. The inner tube (copper) appears to have had some liquid in it while in storage, and the ends of the copper appear to have green build up (verdigris). My concern is with the condition inside of the tubing. How can I be sure that there is not a build up of the toxic verdigris I have been reading about? If there is, what is recommended to remove the build up, or should I just spring for a new chiller? Thanks in advance for any guidance!