I have an old amp which is beginning to show wear and scratches on its RCA ports. However, alcohol, water, and a simple cloth dont work and cannot remove the grime on the ports. What is the best substance to use to clean the ports without damaging the amp?
I've always found a contact cleaner, such as plastic-safe DeoxIT, works wonders for these types of connections. I normally spritz some on the plug itself, then work the plug in and out of the port a few times, spritz again, remove excess, plug in and go.