3fingers· I am a meat popsicle
I have used rubbing alcohol on a rosewood fingerboard for years and years...no problems. I clean the frets and the strings with it. No problems at all. On a Maple neck like a Strat, that is not good. The Les Pauls don't seem to mind and it hasn't been a problem...probably not the best idea to use Isopropyl on rosewood, but in 20 something yrs of playing...never had a problem and it does take off a lot of grime...my thoughts...