Hansk -
First thing I would try is a dilution of denatured alcohol (only, not isopropyl) at about 1:10 with water and a drop or two of dishwashing fluid (surfactant) and scrub gently with a record brush, camel hair paint brush, microfiber cloth, etc. and then rinse, clean and dry as usual.
Should take care of it.
By the way, if you don't have any denatured alcohol handy, use premium vodka - basically the same thing...
Good luck.
Greg
First thing I would try is a dilution of denatured alcohol (only, not isopropyl) at about 1:10 with water and a drop or two of dishwashing fluid (surfactant) and scrub gently with a record brush, camel hair paint brush, microfiber cloth, etc. and then rinse, clean and dry as usual.
Should take care of it.
By the way, if you don't have any denatured alcohol handy, use premium vodka - basically the same thing...
Good luck.
Greg