Hi J.. First off, anything that is cotton, with a screenprint only IS SAFE if you use bleach. Bleach does not affect anything that is screenprinted onto the t-shirt. The only thing bleach will take the color out of is fabric that is already that color. Like: colored embroidery, colored fabric trims, etc. Secondly, sadly, I have done the same with a yellow rag and a load of whites. I tried bleach, oxyclean, and even Shout color-catching sheets. Nothing worked. But hey give it a shot because even if it doesn't work, what have you lost? The damage is done now... it can't get worse, only better possibly. Good Luck!