I would be pretty surprised if cryogenics didn't do anything. I forgot the name, but there is, or at least was, a company that offers this service to the public. They freeze engine blocks, brass instruments, etc. for around $50 depending on the size of the piece. I know first hand that cryogenic bass strings sound good, and last a very long time. The cryogenic technology involves freezing atoms, so they oscillate as little as possible. This reduces the space around them, so they are packed really close. The secret is to thaw them really slowly, so they distributed back out in to space evenly. This even distribution is the cause of the benefits associated with whatever your freezing. Dry ice is very crude approach, but definately worth a try. Just let the cable or whatever take a day or two to thaw.
