So many variables. If its tape lines we would hand spot and agitate with a volatile spotter. Maybe a POG if that doesn't cut in. Generally the carpet film is not that bad. It just needs more solvency than your regular precondition or you'll be fooled and end up with a re-service down the road. 2-4 oz of Prochem's Citrus Pro is what we use but any solvent additive would likley do the same.