Cleaning General Circulation Silver Coins?

First off let me state that this refers to general circulation "pocket change" and excludes anything with any hint of mint lustre.

I recently opened up my washer and found a coin and it struck me that this was now a cleaned coin, which led to thoughts about cleaned pocket change.

I also remembered that when in a local coin shop, where the owner has been collecting coins for 60 years and in business for 30, told me that most of the circulation grade silver had been cleaned.

So I did an experiment and would like thoughts on the subject.

I took 16 Washington quarters that I consider junk and threw 8 in a sock and washed them. I also took 8 and cleaned them with lemon juice , baking soda, olive oil and acetone and simply sprinkled the baking soda, dripped lemon juice on them and when they stopped fizzing dripped olive oil on them and rubbed them between my fingers, then did the same with the acetone and then rinsed.

The "washed" ones cleaned up a little bit. The baking soda/lemon juice cleaned up real well.

So what's a general rule for this?

The top 2 rows are washed, bottom 2 cleaned with baking soda etc.



Before


After


Before


After