CLR is 100% water soluble. Make sure to soak the coin afterwards with distilled water.

Rick,

I’ll set it up tomorrow. We’re having another heat wave here. So, no yard work. Just coins.

Later

Great spotty candidates.
The coin lab is back!

Too late! It’s been CLR’d..
It’s going to PCGS raw, I’ll keep you posted…

Ok Rick,

I have my two test coins. Now I just need to find some disposable glassware.

I’ll keep you posted.

Ok, I guess there’s no stopping this train.

I have some things that I am gonna try too.

Rick,

I’d be careful with that one.

I’m still digging.

I would use a test coin first.

White Vinegar

Baking Soda and White Vinegar

Hydrogen Peroxide

Coca Cola

https://www.kramerindustriesonline.com/product/liquid-finishing-compounds/

All planchets used by the US Mint are provided by outside vendors.

Thanks, yes water spots–if only?…
I recently used acetone on an old Gold coin with pvc residue, with an almost verdigris look as well—Gone!
My 2014-P Unc Set Kennedy has just completed its long journey from being a simple reholdering label gone bad, to being restored & reholdered again…
The coin had some cosmetic issues similar to my 2014 Unc-D coin, but not anymore…Original purchase pic below(scratched holder)..Story later….

Hummm.

The blank planchets might be water spotted and then struck. Thus, embedding “Whatever that substance is” deeper into the coin. It does look like calcium or lime. If we could find a cure for this, we would be………

My cousin is a ChemE. I will have to give him a call. I am sure there is an answer. Last time he recommended 90% acetone and it did not work on my 2014 P&D Unc Kennedys. It just gave me a nasty headache.

Ultrasonics with CLR for a long period of time maybe the answer. Maybe it needs some heat too.

Well, a really great effort there Rick. I think we should keep this one in the back of our minds. Great job.

Thanks Bro

And now for the unattributed “V” coin.
There is no turning back!
It got a 10 min soak, a slight Qtip touch, rinse & dry.

Off it will go!
Wish it luck!….