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Every white T-shirt I own seems to develop nasty yellow armpit stains within 4 or 5 wears. I've tried regular bleach (Clorox) to get these out, but to no avail. Is there a bleach/cleaner out there that's actually effective with this sort of thing or do I have to just keep buying new undershirts every couple months? Thanks.
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Here.
The common theme of all the answers seem to be pretreating before you throw them in the wash.