If difficult to scrape off use a hair dryer or other heat source and it will soften right up. For clean up I usually use acetone but most recommend alcohol as safer. Depending on the blank acetone can remove finish.
Don't use a heat gun, might damage the blank. Hair dryer should be OK. When I have removed epoxy to change guides or to redo them, I used my fingernail and a credit card, being careful not to scratch the finish.
Just had to chime in, since we're sharing recipies:
I had to remove four wrapped and epoxied guides tonite preparatory to a re-wrap. After the usual cutting on top surface of guide foot, and "peeling the orange" so to speak, and unwinding all thread, I was still left with a nasty mess on the blank. After reading the above suggestions, I tried a Pink Pearl pencil eraser, like we used as kids in grade school, as it builds up a good bit of residual heat as it grabs and rolls the remaining epoxy into a gummy accumulation, easily removed with rubbing alcohol. More alcohol, thumbnail scraping,and a VERY light touch from a brand new double edge razor blade left the blank in nearly new condition.
If anybody tries this technique, make sure the eraser is NOT an ink eraser--it will almost certainly mar the finish on the blank. I would go so far as to suggest a test erase on a scrap piece of blank, say a cork reamer, before attempting.