[Mondial]

Something you might try instead of steel wool or metal brushes is a Scotchbrite pad. These are available at hardware stores and are similar to plastic scouring pads. Come in a variety of grit sizes and can be used to gently clean and polish metal.

Try not to get any cleaning solutions into the mica compression trimmers of the RF compensators or IF transformers. It will get between the mica and metal plates, and will take a long time to dry, causing corrosion.