Are the blouses made of any kind of synthetic fabric or a blend of synthetic and natural-if yes, you are stuck, nothing gets that yellow out. Ask me how I know (sniffle), I've lost a few lovely blouses over the years to underarm protection.
I ended up switching to a powder deodorant and haven't used antiperspirants in years because I got tired of finding the perfect blouse only to have the chemicals in the antiperspirants react to the synthetic fibers and leave a very unattractive stain-seems the combination of the chemicals in the antiperspirant react to the chemicals in laundry soaps and that causes a reaction in the make-up of the synthetic fibers which in turn causes the unremovable garment stain.
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