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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?

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    Looks just like a bit scratched surface and doesn't seem to cause any issues. Why is it so important for you to eliminate those marks? – Eugene S Mar 31 '13 at 14:52
  • The amp has some noise... I took it apart and cleaned the circut boards but I still get noise at high volume.. so I'm thinking it might be the plugs. – user7343 Mar 31 '13 at 15:21
  • Can you please specify the noise? Was it hum, hiss or buzz? – Eugene S Mar 31 '13 at 15:27
  • Seems like a hum, but I only hear it when its turned up to high volume levels when connected to a quiet device such as an iPod. When watching a movie, etc. I dont hear it since the dial is not turned as high up. It might actually be my cables (they arent that good) but I dont know. – user7343 Mar 31 '13 at 16:11
  • With volume set to a normal listening level, how close to the speaker must you be to hear the noise? If the answer is a few feet (or less), the noise level is likely normal. If you can hear it from the listening position (or, especially if it intrudes upon the listening experience), this is a problem that warrants further investigation. – Eugene S Mar 31 '13 at 16:17
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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.

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