In 2018, the world's business corporations spent an estimated $400 billion per year on cleaning contracts. See: Peter Levring and Christian Wienberg, "Global Cleaning Giant ISS to Shed 100,000 Jobs, Exit Markets". Bloomberg News, 10 December 2018.[1]نسخة محفوظة 2018-12-10 على موقع واي باك مشين.
In 2018, the world's business corporations spent an estimated $400 billion per year on cleaning contracts. See: Peter Levring and Christian Wienberg, "Global Cleaning Giant ISS to Shed 100,000 Jobs, Exit Markets". Bloomberg News, 10 December 2018.[1]نسخة محفوظة 2018-12-10 على موقع واي باك مشين.
