Cleaned Vs. Circulated

I picked up a 1926-S Peace dollar today which I would grade AU50... which looks that it might have been cleaned at one time. I thought I was missing the 26-S but it turned out that I actually had a filler in my collection that graded approximately a Fine-12.
Originally, I figured using the AU50 as the "filler" but since it might have been cleaned at one time, I don't want to tarnish
my collection with a coin that has been possibly been cleaned.... but it is an upgrade to the F-12 coin... What would you do if you faced my dilemna?
-Dave
Originally, I figured using the AU50 as the "filler" but since it might have been cleaned at one time, I don't want to tarnish

-Dave
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