How to wipe the sealant from the crystal?

Question

Do it yourself

How to wipe it off
Alcohol does not take, I'm already tired of picking it off with a toothpick. By color, the consistency looks like it's not a sealant, but a very old love is chewing gum.

Answer 1

Try hydrogen peroxide, it seems to help some.

Answer 2

Cosmofen 20 helped me, generally a powerful thing, but neat.
https://www.ozon.ru/context/detail/id/146784324/