I live in a really hot climate and I'm a really sweaty person
That must be really hard to deal with.   have you tried an aluminum free deodorant?  It helps me 
That might help my arms, but one time I sweat so much on the way to the store that I had a big sweat stain on my butt!
I am sorry you have to deal with that.   I am lucky because I don't sweat that much.  Can't imagine having to deal with that.  I hope you find something that can help you