I've tried a bunch of things to remove fingerprints and oils from blades before I etch them. Things like simple green, spray brake cleaner, rubbing ancohol, paint thinner, engine degreaser... But I found something that works really nice and easy,3M™ Adhesive and Wax Remover, just spray it on and wipe it off with a clean cloth. I found it in the autobody section of wallyworld. Man this stuff works nice , no muss no fuss.
3M Home and Leisure : 3Mâ„¢ Adhesive and Wax Remover 03618, 12 oz. Aerosol
Jens