How can I safely bleach a polyester shirt?

To safely bleach a polyester shirt, dilute bleach with water according to the instructions on the bleach bottle. Test a small, inconspicuous area of the shirt first to check for colorfastness. Then, apply the diluted bleach mixture to the shirt using a sponge or cloth. Let it sit for a few minutes, then rinse thoroughly with water. Wash the shirt separately and air dry.