Hi, all concerned:

I suppose this stuff is oxidation from loooooonnng storage.

How do I remove it without taking the lettering off, pls? Vacuum?

The ps is in a gpc RV3 case and powers it and a gpc TR3.

I intend on getting them into goc as well, and then trading up to a
TR4CW/RV4 for a modest glowbug station.

TIA & 73,
Dave, N3HE
Cincinnati OH