Clean the stables in a single day.

Heracles must clean the Augean stables. It was hard for him.

Eurytheus asked Zeus's son clean the stables up the cattle.

King Augean's stables were very dirty and smell.

Heracles did it for a single day. Instead of the fact that Augean was rich and had a lot of cows, goats, horses, and etc.

It was the fifth labour of Heracles.