Millions of pilgrims hoping to cleanse their sins by ritual baths at India's Kumbh Mela festival rely on key lavatory workers to clear up behind them -- those born on the lowest rung of the Hindu caste system.
The millennia-old sacred show of religious piety and ritual bathing, which began on Monday and runs until February 26 in the north Indian city of Prayagraj, is this year predicted to be the biggest yet, and the largest ever gathering of humanity.
