the marks are from moisture condensation because it is not properly sealed. I have some on my D2 as well, have not got around cleaning them yet( over 2 years now) but that is on my to do list. Not sure if You can take D3 apart. If you can then just give it a try starting somewhere in the corner to test might want to use some polish to get them off. Just try in the corner to make sure You are not making it worse.
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