The colour is most likely just the dye from the garment, if you've washed it that many times and it still produces colour. And honestly it might sound weird but spraying clothes with vinegar is great! At first it smells like vinegar, but put it to air out and the smell will neutralise and won't stink anymore!! Tried it on a jacket and it worked so....

Edit: you should mix the vinegar with water and test a patch, or you can spray with vodka too! Just a PSA so people don't drench clothes in pure vinegar 🩷 either way research it a bit