Folks, I have NO knowledge of whether this is true or not.
https://archive.org/details/micro-cornucopia-magazine-1985-08/page/n12/mode/1up
S-100 Toolbox by Dave Hardy
Like all bus-oriented, plug-in systems, S-100 boards and frames have
connectors that sometimes get dirty. In fact, about 50 percent of all of
the S-100 problems I have had in the last 10 years have been because of
dirty edge connectors on S-100 boards, or damaged sockets in an S-100 frame.
There's not much you can do about a bad socket (except replace it), but
edge connectors can be cleaned with some isopropyl alcohol and a rag.
Because the pads on most edge connectors are plated with a few mils of
gold, it is not a good idea to simply rub off the dirt and tarnish with
an eraser.
Having been the victim of bad edge connectors that had been erased by
well meaning users, even the idea of using a pencil eraser on a
gold-plated connector used to make me cringe, not only because of the
damage to the gold plating, but also because of the oily residue left
behind by the eraser.
But about a year ago, I discovered that one eraser, the Mars Staedtler
Rasor 52730, not only cleans the connector without damage to the gold
plating, but also leaves no residue.
Since that time, I have used the Mars eraser with excellent results, and
have decided to make it a permanent resident in my S-100 toolbox.
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