I have accidentally washed an expensive rugby top with a maroon t shirt. I now have a rugby top with a pinkish colour collar.
I have tried Dylon S.O.S. colour run on it twice. It is a little better but still not white. I cannot use any bleach on it due to the colours on the body and arms of the top.
Any ideas on how to get the collar whiter.
I've had something like this happen me, except with red and white shirts. Personally I've tried a few different washing powders, vinegar, baking sofa, washing soda and nothing turns the white shirts back.
I guess you're out of luck, and take this as a lesson?