"Am sure you all will get inspired by @iHrithik's efforts! He has made a significant effort towards creating a Swachh Bharat. #MyCleanIndia," Prime Minister Modi tweeted.
Modi also re-tweeted photographs showing the actor leading a group of people in clearing garbage at a street in Juhu in Mumbai.
"I started cleaning my own surroundings and learnt so much. Started with my lanes In Juhu.
"Went around talking, learning and informing residents, watchmen and workers about better ways to keep our society clean," Hrithik wrote.
"2day, I pledge 2 keep my home, my roads, my city my country clean. I also take responsibility 2 teach n empower others 2 follow. #swachhbharat," reads another message on his twitter.
The Prime Minister also acknowledged Nagarjuna, who joined the campaign.
"Noted actor Nagarjuna joining 'Swachh Bharat' Mission can draw many others towards our efforts to create a Clean India," Modi tweeted.
A video in which Nagarjuna is taking pledge and participating in the campaign was also uploaded.
Another video showing a team of youngsters carrying out cleaning activities at Connaught Place in New Delhi has also been upload.
"I feel this video will surely inspire my young friends to join 'Swachh Bharat' Mission," Modi tweeted.