[Cynthia, Prescott, AZ]

Don't use alcohol. Heat the blade until it is very much past the too hot to touch stage. Don't know if a candle would do it, but some of these propane lighters can put out a heck of a flame similar to a blow torch. Otherwise, soak the cutting tool in 10+% freshly made bleach solution, or a saturated solution of trisodium phosphate, not one of the substitutes, for about 20 minutes. Timing is not exact, but do it longer if you think the tool may not be particularly clean. Or, use a new unhandled razor blade.