Hi, Chlorine doesn't stain. Unfortunately, it removes color. I'm afraid the only options you have is to either get some RIT color remover and bleach the shirt white, or dye the shirt. To get a more even color, it would be wise to bleach it out first. Just follow the directions on the box. RIT may be found at your local grocer or Wal-Mart. The price normally ranges under $2.00 per box.
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