I have spent considerable time cleaning up my Gmail and Google docs because I am getting the big red warning about storage. I've used their data management tools and various interfaces. It is clear they don't want me to clean up my date -- just upgrade. They make it real hard, and every turn -- you should just upgrade.
@kin have you tried the silver handle on the side of the tank
(yeah, maybe 'set a filter' or something + it just works)
@jbminn I spend lots of time on filters, but many accounts alternate their fingerprint and bypass.
@jbminn I'd also like clean up automatically everything after 12 months.