I have a B&O amp (Beomaster 1900) that I am going to partially restore. I say partially restore because I am not going the whole hog with applying new timber veneer/full recap/transistor upgrades/etc. My problem is the metal base and rear panel is suffering from surface rust and I am looking for ideas on the best way to at least neutralise the rust without affecting the silkscreen? How well would diluted white vinegar work whilst not affecting the silkscreen? Post treatment? Clear lacquer or car wax? Thoughts/suggestions/ideas welcome.