350 g Kleanium™ Contact Kleen – Electrical Contact Cleaner, hands down the number one best upgrade for your hi-fi system, simple to use, spray on all audio contacts, power terminals and on plugs, (may also use a cotton bud to assist). Removes oxidation, oil and other contaminants. Restores electrical continuity by 100%. Safe to use on most plastics, metals, electronics and electrical connections.
Forget about spending $1000's on power cables, speaker cable, interconnect upgrades if you haven't tried this first. Garrentied to provide immediate remarkable improvements!