Chye Thiam Maintenance was started in 1979 by former pig farmer Tan Chye Thiam. His son Edy Tan is now CEO and tells Sumiko Tan why roadkill and oil slicks are all in a day’s work.

Edy Tan cleans up after Singapore.

Every day, his army of 2,700 workers fans out across the island to scrub hundreds of buildings, maintain 1,700km of roads including all 10 expressways, and sweep attractions like Jewel Changi Airport and Resorts World Sentosa