• Introduce the foil in a sterile flask containing 100 ml of recovery medium + Tween 80 at 0.05%Or Addition of 100 ml of recovery medium containing Tween 80 at 0.05% in the bottles.Or cutting the deposit on the external surface of the bottle to introduce the contaminated part in a sterile flask containing 100 ml of recovery medium + Tween 80 at 0.05%