From HOSA:

CAIG DeoxIT^® is a fast-acting deoxidizing contact treatment solution designed for use as a general treatment for connectors, contacts, and other metal surfaces. DeoxIT chemically improves, rejuvenates, and protects electrical connections for cleaner audio.

• Rejuvenates, protects, lubricates, and improves conductivity
• Reduces intermittent connections, arcing, and RFI as well as wear and abrasion
• Safe for use on all metal connectors and contacts and will not harm plastics