The health stores sell a crystal deodorant there are several brands and they are very effective and best of all wont stain your clothes

Driclor deoderant is brilliant or else after your shower use talcum powder before you put on deoderant. And wait at least 15mins after your shoer to put on deoderant because if your still warm it'll just vanish

I use sure cream stick. It's the only one I can use which minimises sweating under my arms. I've been told that you can get botox for your arm pits which stops the sweat glands producing sweat! I personally don't like the sound of it. But it does work!

I sweat alot underarm & after years of trying different things I've found the perfect combo - crystal deodorant and wool. Crystal deodorant is antibacterial so although you sweat it never smells. I now wear vest tops or tops made from pure wool, merino wool or bamboo (usually in dark colours). All these fabrics have antibacterial properties too so no smell there either. If I ever wear any other fabric I use body spray as well. I feel loads more confident & I never worry about sweating now.