Augean

adjective

1. Gr. Legend of Augeas, king of Elis, or his stable, which holds 3,000 oxen and remains uncleaned for 30 years until Hercules, as one of his twelve labors, cleans it in one day by diverting a river (or two rivers) through it
2. very filthy or corrupt

Etymology: < L Augeas < Gr Augeias