I bought some special deodorant at the weekend; it works by blocking your pores or something if you use it before bed like every few nights, maybe even less. Anyway it worked instantly and my armpits have been dry as a domino ever since. Burns like a motherfucker when you put it on though, but worth it.
It's actually amazing and may change my life. I'm thinking of using it on my hands and feet next. Imagine that, no sweating in the arms and feet.