I was really impressed with how fast vinegar knocked mine out. After shampooing I'd pour some on my head and massage my scalp (no fingernails, folks, just fingertips) and rinse before using conditioner.

I thought it'd be easier to have the vinegar in a spray bottle, but nope. So acidic it are the plastic tubing.

It took maybe 8 occasions of hair washing over weeks. Never had it again.