I just bought a cigar plank from a thrift shop. Two of the molds have some residue of an unknown polymer, which I want to remove.
It's about the middle of the board, so perhaps it's some elastic glue that held something in place to hang it by.
I've scraped a lot of it off, but I can't get it all this way.
The molds are untreated wood. How do I remove this residue?