At the launch of Swachhata Hi Seva movement by Prime Minister Narendra Modi, NDTV - Dettol Banega Swachh India Campaign ambassador Amitabh Bachchan spoke at length about the annual 12-hour Cleanathon held every year on Rashtriya Swachhta Diwas on October 2 and its focus on raising awareness about 'cleanliness' and the difference it can make in an individual's life.