Suggest you buy a new glove but what I now do having suffered like you is get a small supply of white cotton gloves from Boots and use as an inner glove and barrier. It keeps the sweat from impregnating the expensive glove and you just need to machine wash the cotton one every time you use. Nice and fresh for the next shoot. It also makes it a lot easier to remove the shooting glove without it sticking to your sweaty hand!
Hope this helps