Do connection/contact solutions work or not?

I use a product called STABILANT 22A; which is an electrical contact enhancer. It has been around for a long time and is used heavily in the electronics industry. I own a 20 year old media duplication and media editing company; and have used it extensively in our three studios. Works great and dosen't leave a film or get sticky. Also used in my mostly McIntosh and JM Lab audio systems at home too.

Thanks for the good answers. Preventative maintenance is always good.

I would agree with Larry. The purpose is to remove and/or prevent oxidation. If the contact is already clean, it doesn't "improve" sound; rather it prevents it from deteriorating. If the contact is dirty, it "improves" the contact in the sense that it restores it to a clean state.

I like kontak. It does improve the sound-sometimes its not so subtle. If you have tubes, apply it to the pins and sockets. (With the power off!)

Works with all signal and speaker cables.

the right ones like pro gold work, they keep the sound from degrading not improving it.
Larry