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I remember hearing somewhere that using bleach makes sweat stains worse, so I googled it and so far only found one site to confirm this, the rest say to use bleach.
here's what
mrscleannw.com says:
"Although it’s counterintuitive, chlorine bleach is one of the worst things you can use to treat perspiration stains, even on white cotton fabric. The chlorine in household bleach will react with the proteins in the perspiration and cause the remaining stain to darken even further. You thought the pale yellow stains gave you pause – just wait until your collar and underarms are almost mustard in color!"
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I'm fairly certain that it's a chemical in deodorant that actually makes the yellow stains, not the persperation itself. Zinc something.