Glue from the blister or something else?

[Sovstacker]

Four (4) months after the purchase of this coin (2010 bullion gold sovereign), i took it out of its sealed (I believe it was sealed) blister to store it in a capsule as usual.
By placing it in the capsule and looking at it from an angle, I saw these signs that were not visible or I had not noticed, while it was in the blister.

Do you think this is glue that was in the blister or something else?

Is there a way to clean it without damaging the coin? (meaning that after cleaning it can get a grade and not details cleaned, regardless of whether it's worth sending for grading)

Thanks in advance

[Shep]

Can’t really tell from the picture all that well but it does look like glue.

It’s only a modern bullion Sov so if it was me I would probably just try the old soap and warm water or put it in the ultrasonic cleaner 🤷‍♂️ 

I assume you were speaking hypothetically about getting it graded. I believe the only way to 100% safely “clean” a coin and not get a details grade is to send it for conservation and let them do the cleaning themselves.

[dicker]

I do not clean coins but have seen and heard of the use of acetone to remove glue / gum. Followed by distilled water and high pressure air to chase off the distilled water.  
 

Best

Dicker