Leave the blade in or just use a new one every time they are cheap and i always like the feeling of a new blade. leave it out to dry like you said. I clean all my razors every once in a while and then put it in barbacide which cleans of the soap scum real nice and disinfects it. Dont worry about soap scum it will wash off, if you feel like its getting bad get some maas polish and give it a shine.