| Clue | Source | Date |
|---|---|---|
| Machine often used to clean the exterior of stone buildings | The Times Specialist Sunday | 02 Dec 2018 |
| Loud building-surface cleaner | Newsday | 14 Jun 2017 |
| Compressed-air tool | USA Today | 23 Nov 2015 |
| Surface-cleaning tool | The Times Concise | 13 Jan 2015 |
| Compressed-air tool | ||
| One for whom silicosis is an occupational hazard | ||
| Paper tool? |