Many thanks to the wonderful people at Razorbladesandmore, I got a free pack of Treet Classic blades with my order. Are these carbon steel blades, and if so, do I do anything special after I use the blade? Do I need to dry it carefully? I seem to recall threads about carbon blades rusting or somehow needing more post shave care, but I do not remember the specifics. Any suggestions or guidance would be deeply appreciated.