On Mon, 12 Apr 2010 13:16:00 +0100 Mike Tomlinson
wrote in Message id: :

In article , Arno
writes

That sounds like BS to me. A soft pencil eraser cannot remove silver
sulfide, it is quite resilient.

It's a technique that has been used on edge connectors for many years.

Yup, and it works. I learned the technique when servicing Multibus I
systems, and still use it to this day.