Jim, this is very interesting to me as I also have that problem. I've tried just about everything but still have the problem. I fear the possible toxicity in most antiperspirants, so I wash frequently, try to stay cool, & use vinegar or baking soda or Aubrey Organics deodorants. Last year I posted the following thread here but got no responses at all:
Underarm Odor and Amantadine
Apologies for posting a sensitive subject, but I've noticed something very interesting about Amantadine and wonder how it might be related to PD. When I took Amantadine, I totally lost a difficult and embarrassing problem that I've had ever since my teens: unusually heavy underarm sweating with a very bad and persistent odor, especially under my PD-affected right arm. I personally believe this odor is related somehow to PD and might be an early biomarker for some types of PD. It's almost as if my body is trying to eliminate toxins or something through my sweat. I'm going to stop Amantadine, because it didn't help my PD symptoms much if at all, and is giving me intolerable insomnia. But I will certainly miss this one great side effect!
Any comments or similar observations?