Not frustrated, just wanting specific answers. But, I was kinda pushing back against the urgency you felt, and emphasizing that a reliable 'fix' requires specific accurate info from you. I end up doing that fairly often.

It's sorta like a doctor saying, "Yes, yes, I'm sorry it hurts. But WHERE exactly does it hurt, and WHEN did it start hurting?"

If you're not worried about bleaching, use the chlorine bleach as suggested.