When Hercules approached the kingdom of King Augeas, a horrible stench set upon him making his legs and stomach feel weak. King Augeas had a vast quantity of immortal livestock that produced enormous amounts of dung; the stables they lived in hadn't been cleaned for 30 years. It was so bad that no crops could grow, and a pestilence was killing the people who lived in the kingdom. Rather than cleaning the dung bit by bit, Hercules noticed two rivers running nearby called the Alpheus and the Peneus, which gave him a great idea. With might and main he worked hard to redirect the two rivers, making them flow through the stables. The two rushing torrents swept away the long accumulated filth. Thus the Augean stables were cleaned completely in a single day.
Please replace cache exactly how you found it, so it remains mostly hidden from all sides.
The hint pretty much gives it away.