- Saudi Manpower Solutions Co. (SMASCO)
- 2,030 people
- Saudi Arabia (Riyadh, Saudi Arabia)
The largest house cleaning lesson consists of 2,030 participants, achieved by Saudi Manpower Solutions Co. (SMASCO) (Saudi Arabia), in Riyadh, Saudi Arabia, on 13 April 2018.
The lesson was part of SMASCO's continuous employee training.