So today I dug up a wheatie that was completely encrusted with crap. Peroxide, dish soap and baking soda were having no effect on it. I then pulled out the bottle of CLR and let the penny soak for ~5 minutes in maybe 5ml of it. I then pulled it out, rinsed it off and found out I have a '39D(my first kinda sorta mini key date wheat). Here's a couple pics. I'd like to hear your guys' imputs.
First coin: cleaned without CLR, this is what the CLR cleaned coin looked like, but on the obverse.
Second: CLR cleaned
Third: A control, got this one in change at the gas station a few weeks back.
First coin: cleaned without CLR, this is what the CLR cleaned coin looked like, but on the obverse.
Second: CLR cleaned
Third: A control, got this one in change at the gas station a few weeks back.