What is the best thing to buy/or do to clean connections on IC's and SC " ??


Well, whats you thoughts and how important is this ?
schubert
schubert-if you decide to try naphtha, make sure its naphtha only. Just a handful of brands are available and half of those brands sell liquid naphtha mixed with another chemical. Try one of the older classic hardware stores in your area.
All electrical connections and contacts should be cleaned, including wall outlets. Not only audio wall outlets but wall outlets for appliances, TV, floor lamps, microwave, etc.
Has anyone used Stabilant 22? I heard it is the basis for Caig DeoxIT products, but I don’t know if this is true. It’s available on Amazon as a concentrate you dilute, or not.

I have used 99% isopropyl alcohol to clean connectors, then DeoxIT. Instead of Q-tip brand cotton swabs, I purchased the cotton swabs women use for make-up. They are more tightly compacted and so don’t shed fibers as easily. You can purchase them at a drug store.

I have a bunch of RCA cleaning tools I purchased years ago. They are white plastic devices. One end is male, the other female. They were sold under the names Signet or ConneX. I don’t know if they are available anymore.