The idea is if you dry your razor completely after each use, it will last forever. It's moisture that erodes blades, not friction. They even sell some razor dryers in drug stores lending some truth to the myth. What do you think?

Neither explanation is true. Razors are made from stainless steel; you would have to store them in battery acid for corrosion to be noticeable. And blades don't really dull over a short time. What happens is that the very fine edge gets bent and partly folded over on itself so the sharp part doesn't come to bear on what's being cut; only the much duller folded portion does.

This happens quite quickly, and it happens with kitchen knives, too. Which is what that funny ribbed rod everyone mistakenly calls a "sharpener" is for - you gently run the blade edge across it, and the ribs catch the folded edge and straighten it, putting the still-sharp cutting edge back into play. Most kitchen knives don't need actual sharpening more than once a year, at most, even with heavy use; a daily straightening will keep them cutting quite nicely.

There is a new "sharpener" available for razors that appears to work on this principle, but it only attacks one side of the blade, so I doubt that it works as advertised.

I actually heard this idea again today on a national radio show. The host says he uses alcohol to dry his razor and he's had the same one for months. Just radio babble?