While the eraser removes oxidation and dirt, one does need to clean afterwards with Iso-PrOH; the concentration most commonly available is 91%, but the 9% water is an Azeotrope and using a higher concentration of IPA means another chemical such a benzene has been added. This is fine for chemical reaction in a lab, but the alcohol pulls away the water molecules as it evaporates. So anything above 91% is a waste of money (thank you, IBM).
The freshly cleaned contacts only need a protection layer if copper or tin; gold contacts do not, as gold does not oxidize.
That being said, the A3000 is the most beautiful of the Amigas, but one of the worst designed: sharp steel metal edges, D800 fiasco, ZIP memory insertion, 25-pin SCSI connector above another identical 25-pin parallel port, INT2 issue, requirement of daughter board to be in place to boot, flawed WD SCSI controller (8 revisions to get it to work?), and a complete lack of drive space -- CDROM & second HDD. After bleeding to the point of anemia restoring two, I sold them never to return. In my opinion only!
http://en.m.wikipedia.org/wiki/Isopropyl_alcoholhttp://gold.yabz.com/facts.htm
