Armpit Stains

I use Arrid XX. My shirts most often end up in a pile on the floor for weeks on end before I finally get around to washing them, and there aren't any stains on them. Well, armpit stains. Mustard is another story . It doesn't smell like shit but its a bit of an eye irritant, any sort of residual spray hanging in the air whatsoever stings quite a bit. I've never used any other brand that does that to me, but this brand works and doesn't leave stains =/.

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On another note, has anybody had something like a "deodorant immunity" build up where for a few days no matter what you do, your deodorant just DOESN'T WORK??? Well, I mean the anti-perspirant part of it. After those few days it just starts working again =/. Weird. I've had this happen with all brands I've used.

Jam it back in, in the dark.