Organisers expect 400 million pilgrims will bathe during the six-week-long festival
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Millions of pilgrims at India's Kumbh Mela festival rely on toilet workers from the lowest Hindu caste to clean up behind them
5,000 workers are hired to clean the toilets -- almost all from the lowest rung of India's Hindu caste system
Organisers say modern tools have been brought in to tackle the waste
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 behi…