Augean stables

noun[usually plural]3

1. •
   The stables where King Augeas kept his vast herd.
2. •
   An extremely filthy or untidy place or situation.

   • She ordered him upstairs immediately to clean the Augean stables of his bedroom.
3. •
   (figurative) A place or situation characterized by corruption or moral decay.

   • Augean stables are everywhere under the Congress Raj—whether in agriculture or elsewhere. Only a few days back there was a huge fraud in the CHS dispensaries. — 1972