Quite a lot of confusion and plenty of mistakes running around here.
First of all, only ethanol (ethylalcohol) has any real desinfecting abilities. It is mostly a fungicide and bactericide, it much less kills virusses, and spores not at all. Secondly, 70 % ethanol (preferably with water) is the best working concentration, anything lower or higher is less effective. You're best of wetting a cloth and repeatedly wiping the blade or any surface with it. Be careful with ethanol on other materials than metal or glass, results may vary, it is an organic solvent after all.

The surest way of sterilizing a blade would be to bake it at 180 °C for 4 hours or more. I don't think this would effect any heat treatment or result in blade warping, although we're talking very thin edges of course.

Autoclaving would be good as well, but not recommended due to the humidity and high carbon content of razor blades. Someone should try this actually, I'm curious as for the result.

I don't know anything about Barbicide or those other products. We use javel in the lab, most of the time. Cheap and VERY effective. Quite harmful to a lot of things tho...