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BadThad... what does the variation in soaking material do? I'm not sure what would be accoplished by a soak in distilled water (other than to remove Acetone and Xylene)...
Liquid solvents have differing polarities, i.e. charge differentials. Residues can also have a wide range of polarites, polar to non-polar. In chemistry, there's a saying "like dissovles like". In order for a solvent to be effective, it has to be "like" the residue. As an example, take some tar and try to dissolve it in water....nothing will happen. Now, take some tar and try to dissolve it in xylene, it will completely dissolve. Tar is a non-polar residue and xylene is a non-polar solvent, like dissolves like. You can also think about your hands. Work on a car and your hands are black with grease. Do you think simply rinsing them under water will clean them? Of course not, because grease and oil are non-polar and water is a highly polar solvent.
Also, there is no need to rinse after using acetone or xylene, unless it's with more, fresh, clean acetone or xylene. Both solvents are volatile and will evaporate away on their own in seconds. In fact, I NEVER recommend letting ANY water on a coin surface since it was the root cause of corrosion. The final step should be acetone, which will remove all traces of water and dehydrate the surfaces.
In the end, we want all traces of water removed before storage.
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