Right Guard Xtreme (Anti-Perspirant & Deodorant) 1

My husband wear right guard extreme sport gel deodorant. no matter how much or how little he uses, it makes the under arms of his undershirts stiff and hard. After about 6 weeks or so, the shirts will even gets holes in them. I have tried spraying them with stain remover, soaking them in bleach, nothing works. I cant imagine what its doing to his skin!