Ok, Now That You Own A Cleaned Coin...

That only works if the coin was not improperly cleaned. If you have an overdipped out Morgan dollar, like I have, and put it in the window, like I've done for about 2 years with the same coin, you now have an improperly cleaned coin with some (possibly not-so-nice) toning over the surfaces. It's obvious to anyone who's familiar with cleaned coins that the retoned coin was cleaned. I can still probably only sell my coin for melt.

Now, if the coin was lightly cleaned (i.e. not glossy or hairlined) then some retoning couldn't hurt.

As I mentioned not all window sill systems could possibly give the same results to even the same coins. Remember all the massive possibilities that arise. For example how often do you open that window? What direction does it face? What climate do you live in? What do you cook in that room and how often? What is the temperature and humidity on that window sill? See what I mean? Many, many possible differences in each attempt.
On all the cleaned coins I've tried this with I usually, not always, try to remove any possible cleaning or polishing agents done by others prior to my window sill adventures. AND I usually get many different results to this. For example I've been given a Indian Head Nickel that for some reason was almost black. I have now spent many months attempting to get that black color off with absolutely no results. Even mild acids haven't worked and it too is now on that window with many other coins.
As I mentioned some, not all, have actually passed the eyes of some rather professional dealers as a NOT cleaned coin.

I haven't tried this on a coin, but it should work - although I don't know what the result to the coin would be.

I know that if someone uses a permanent marker on a white board, the way to remove it is to go over it with a dry erase marker. When you erase the dry erease mark - the permanent mark comes up as well.

Provided the permanent mark is on a flat field I don't see why this wouldn't work. But you would need to erase with something soft enough that it doesn't leave hairlines.

I'm not sure I would try this on anything other than junk silver though. I'm just throwing the idea out there.

I have a few coins that I have used a silk cloth to wipe a coin's surface causing no visible damage. Any thoughts on using a silk cloth on a coins surface? I also heard from an older gentleman, that you could use a thorn from a tree to rub away dirt spot's and that it would not damage the surface of the coin, because of the natural oils from the thorn. Has anyone else heard of this?

Dry picking or rubbing is a BAD idea. If you want to remove finger prints, just rinse them with acetone and be done....no rubbing.

I kid you not -- I gave one of the neighborhood kids a few coins, including a Walking Liberty half, to get them in the hobby.

So of course he brings them over to show me one day, and they're all cleaned :-\

Of course. Human nature to clean coins one way or another. If you watch carefully you will see many people spitting on their fingers and rubbing a coin to see the date better. Dirty coins don't look pretty either so parents tell kids to clean those things. Many women dump coins in their jewlery cleaner to see how it works on them.
AND if you read all the search things at the top of the forum for cleaning coins or coin cleaning, you will always be amazed at how many times and varieties that this is being done.

I've used ammonia on some old silver. Nothing of high value but it does a nice job on silver. PCGS even mentions it here:
http://www.pcgs.com/articles/articl...d=105&type=1
Never gotten a consensus answer on what ammonia use equates to...dip, clean or preservation. Don't overdo it though or it ruins a coin but used judiciously it is ok. I bet many older silver coins for sale both raw and graded have seen it.

Maine_Jim