I'm going to clean a Berliner Weisse that sat for Five months - hot PBW solution to start, but it is a glass carboy, so no stress fracture worries, just regular fracture worries! I use my BB on short term fermenting beers that leave less of a mess. I also have a Dubbel in a plastic bucket that was looking highly crudded up and is ready for racking to secondary, so PBW will get a lot of use at my house this week.