So I cut open my kegs the other day to convert to keggles and noticed what looks like rust on the inside. Is this rust or just residue from the old beer? I let some PBW sit overnight and it didn't do much. Anyone else seen this and know how to get rid of it?
oxyclean with hot water soak for 1 hour. then if any of the crud remains use barkeepers friends and a green scrubby. the advantage of using oxyclean is it also passivates your kettle