"I congratulate the Dabbawalas of Mumbai for joining Swachh Bharat Mission & extending their continued support to it," Modi tweeted.
"The efforts of the Dabbawallas of Mumbai is exemplary. Despite their hectic schedules, they devoted themselves towards a Clean India," he said in another tweet.
Dabbawallas carry lunch boxes to the people of Mumbai from their home to work place and schools and are known for their unfailing punctuality round the year and have a huge network in the city.