I typically put my bottles in oxyclean and then get lazy for 3 days. Never had the film. Though I usually use 3/4 cup per 5-6 gallons. Maybe pbw would take it off. Works for most other things.
1st Brew: Black IPA
2nd Brew: Pilsener Urquell Clone
3rd Brew: Pliny the Elder Clone
4th Brew: Dogfish Head 90min IPA Clone