a new broom sweeps clean, but an old broom knows the corners

• a new broom sweeps clean, but the old broom knows the corners
• a new broom sweeps clean, but an old broom knows all the corners

a new broom sweeps clean, but an old broom knows the corners

1. (Commonwealth of Nations) New management imposes radical changes, but those with prior experience have more knowledge.
   • 2017, 28 May, Does the song “Amadlozi” by the late Brenda Fassie ring a bell? — Mpulanga News

     It is said that a new broom sweeps clean, but an old broom knows the corners – this does not apply to Mbombela’s social scene.

   • 2016, 22 December, — The Conversation UK

     Chibnall, like Moffat, like Davies, like Capaldi, Tennant, and many others involved in the triumphant reboot, is a lifelong Doctor Who fan. His arrival should remind us of the full version of the old adage: a new broom sweeps clean but an old broom knows the corners. There are lives in the old Doctor yet.

   • 2011, Little Nuggets for Life's Experiences, →ISBN

     It has been noted that the new broom sweeps clean, but the old broom knows the corners. Every now and then, the older broom must trust the young broom's judgment.

• a new broom sweeps clean (ellipsis)