I like the idea but, in reality, both the coin and my fingers are bone dry long before I'd get any chance to rinse OR blow-dry the coin, it evaporates that quickly. I don't treat acetone too seriously to be honest. It will remove a lot of gunk you may have thought you were stuck with but, and more importantly, it also degreases coins very effectively, hopefully ruling out any future print or unevenness of tone. Every little helps, as Azda (or is it Tescos?) would say!