I've used the same 4 pack of razors for almost a year now. The reason being is that razors need to be super sharp. Adding anti-corrosives to the metal being used would cause the razors to be weaker and thus less sharp. Manufacturers have decided to go with no anti-corrosives all together. Hair does not make a blade dull. When the blade gets wet, then is left to dry, it oxidizes and the next time you shave it chips very slightly at the edges making them dull. You can use hot water all you want just make sure you blow dry the blades completely dry when finished.

There's no myth about any of this it's fact. I was told all this a couple years ago by a metallurgist and decided to give it a shot. Now I only get new razors because sooner or later I lose them.