I like to have it to make them show up in photos. Usually people use stuff that comes right out. (The safety area, geishert (sp) should have whiting).
I would be very careful in any kind of solvent.... If Hoppes doesn't work, then maybe they used something more like paint?
Persistent rubbing with a small toothbrush and hoppes didn't work, then maybe use a wood toothpick to test how hard it is?
Ed
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