I did the same, until I saw a tip that somebody posted here :)
Since then I've been using the same Gillette cartridge (it's been over a year) and it's still as sharp as it was when I bought it.
The trick is to rub it against your bicep or forearm (effectively stropping it) before use. I also do that after use, which helps to dry it up (keeping it even sharper).
I've already saved a small fortune on cartridge refills. Best shaving tip I ever got!
I do the same with my safety razor, and just always make sure to store it in a dry place, not in the bathroom, just to be safe. I don't remember the last time I replaced the blade.
The trick is to rub it against your bicep or forearm (effectively stropping it) before use. I also do that after use, which helps to dry it up (keeping it even sharper).
I've already saved a small fortune on cartridge refills. Best shaving tip I ever got!