I have a shirt that is 95% polyester and 5% spandex. I'd like to completely whiten this shirt. How can I accomplish this?
Related: Fade color in fabric
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Bleaching works "as expected" for natural plant fibers (e.g. cotton). Polyester is actually a plastic, and bleaching will not have the same effect. I expect one (some?) of the following:
Bottom line, I would not even try. A new white shirt must be quite easy to find, and quite cheap.