OK, phew, blimey!Right! So, yes, the ear-cleaning thingies! Re the mopping, it was a term I used to differentiate from the term 'scrub'! Essentially, I saturate a bud and swab the area as much as I dare, and this is determined by the coin (hammered, BU 20th C), and also from my personal experience. Now, the personal experience bit comes from the artificial light thing I spoke of and, essentially, a decision about what moves the coin between desirabilities? What I mean by this is, would you decontaminate a little more aggressively on a C1 farthing punctuation to better reveal it, for the overall historical value, and personal (maybe commercial) value of the coin, against the gentle acetone 'wash' of a BU e7 penny? I confess to 'wiping' my coins with a Q tip saturated (soggy) with acetone, and have arrived at how vigorously I can do this on account of my watching the effects on lesser coins! Please don't use daylight as your measure for hairlines! Use artificial light! Everyone, get a lamp, a cheap BU coin, and check out the effects of a Q tip on the surface! For myself, I have never noted an affect! Also, I consider, re acetone, that I've preserved the present state of a coin by preventing further 'undisclosed' deterioration! To further add, I'd happily give a man a Qtip, a hammered coin, 24hrs, and defy him to show me a difference! For every coin thereon in, it's a measure of gentle respect thereof! Love coins!