But they are conducted with exemplary sensitivity, and the cooperation of the residents, and 80 per cent of profits are donated to local charities. Most importantly, they certainly did not feel exploitative to me. In fact I found touring a place like Dharavi to be an education. In the recycling area old ink vats, cooking-oil containers and paint tins were being returned to gleaming perfection, while scraps of trashed plastic were converted into pristine pellets and twisted aluminium was returned to ingots.