Well I've used most of the afore mentioned stuff you read up on just for what it says.
I've had red fabric bleed/run in a quilt I made and about died! Red is always the hardest to remove.
I've even used a professional hair color remover that smells like sulfur (lovely).
But if the fabric is scotch guarded esp. if it was fabricated jumpsuit rather than hand made I'm sure it has been treated due to the fact it was made for industrial purposes. The fabric content are all factors in color removal.
Its a science in its self. Try most everything and anything really. I've had my ESB jumpsuit hanging out in the sun to fade it and weather it.
Good luck!