[Mr Apple]

Cleaning the coins was an adventure.

Not to belittle your endeavor, but actually cleaning coins totally ruins any numismatic value. Of course, they were where worthless anyway, lol.

[Anitius Severinus Boethius]

The type of cleaning he is referring to is to clean the debris from the coin so you can actually see what it is. Not shining them up. When you get those batches, they are sometimes clumped together by the filth and dirt that they were discovered in.

[Celtic Conservative]

Oddly enough one of the things that some coin preservationists use to clean finds like this is Coca Cola.

CC