Samajwadi Party (SP) chief Akhilesh Yadav on Wednesday attacked Prime Minister Narendra Modi for doing nothing to clean the Ganga, a promise he had made in the run up to the Lok Sabha elections in 2014."Swachh Bharat - Failed," the former Uttar Pradesh Chief Minister tweeted and said that the Modi-led National Ganga Council did not meet even once in the last five years of the NDA rule between 2014-19.He also said that 351 stretches of rivers in India were now critically polluted, up from 302 in 2016.The SP chief further said that seven of the world's 10 most polluted cities were in India and the cleaning and sanitation efforts have been left to the lower castes. Thereafter, he called upon people to "vote for Maha Parivartan".Yadav has been attacking the BJP and Prime Minister Modi almost on a daily basis, raising a myriad of issues like farmer distress, growing unemployment, failed economy and poor law and order in Uttar Pradesh.