I always do a good soak or rinse in acetone first. I figure that if there is any goo or wax or oil on the coin it's going to be harder for the Verdi-Care to make contact (I also want to make sure I get rid of any corrosive contaminants that might be adhered).
I have a number of small, square, microfiber cloths that are meant for cleaning lenses. I take a clean one and fold it in quarters, and in one corner I soak a spot the size of the coin. I place the coin on the spot, then press it in using a dry part of the cloth. I don't use a twisting or rubbing motion at all - I just press it in repeatedly so the whole surface gets thoroughly soaked. I flip the coin over and repeat, again using a dry part of the cloth which absorbs the excess fluid from the treated surface and pulls off anything that was loosened up. I keep flipping and pressing until I feel like it's not making any more progress. Then I dry the coin by pressing it repeatedly between dry parts of the cloth.
Occasionally I'll have a coin that seems like it needs more help than that. I'll start over from the beginning with the acetone, stripping away any oil or lingering Verdi-Care, and then repeat the treatment. Usually a coin this bad doesn't really improve any further though.
Edited by CaptainFwiffo
08/17/2012 10:20 am