I've seen Maple leaves do this .....maybe a rinse agent they used. Does a dip in acetone remove them?
@Bman33 I got them and they looked great, and before too long, they looked like that. It seems every time I look at them they are worse. @Paddy54 I am very inexperienced with cleaning and I don't think they are cleanable
You're not really cleaning them just dipping them ,I purchased a silver Ike and it was so cloudy just a dip in and out and it was sparkling again.
I thought they came like that, didn't know they could originally look nice then get milky later. Yikes.
I have a 2016 ASE in a TPG slab. It ended up with spots on it, they weren't there when I bought it. It's not spreading. I've considered busting it out of the slab for a dip.
I have had spots on proof coins that I treated with a drop of eZest and then rinsed off almost instantly and had good luck.
Use airtight containers or if you use vinyl Flips tape off the open section with masking tape. It's the Broax they use I heard when having the die strike the coin so the die doesn't stick or something.
Borax lubricants may still be used in some metal manufacturing, but modern lubricants seem to have phased such out as that technology started before 1940s. There are such hazards using borax that most have switched to specialized organics. IMO http://www.cleanersolutions.org/downloads/msds/751/Borax MSDS.pdf
@Paddy54 what do you recommend for the dipping solution? And how should I neutralize it afterwards? I have never had the need to dip and I was wondering any advice you can give
Acetone dip it pull it out and allow the air to dry. No need to do anything else. The acetone will evaporate off the coin in a matter of seconds . Pat dry with a soft micro fiber cloth. You should see a major improvement .
My attempt at acetone for milk spots was a failure. Soaked the Maple for over 12 hours and nothing. It did remove the fingerprint on it nicely though. Acetone works for removing organic stuff from your coins. If you do get results using acetone for milk spots let me know.