are you referring to cooper oxide deposits on connectors ?
in any case, be careful what you use, as some chemicals , in addition to serving as a solvent, affect frequency response.
i would think dishwasher soap and water, taking care not to damage the component would be the safest approach.
in any case, be careful what you use, as some chemicals , in addition to serving as a solvent, affect frequency response.
i would think dishwasher soap and water, taking care not to damage the component would be the safest approach.