| Clue | Source | Date |
|---|---|---|
| Hazardous material cleaning, briefly | LA Times Daily | 22 Jul 2020 |
| Hazardous material cleaning, briefly | The Washington Post | 22 Jul 2020 |
| Radiation cleanup, briefly | New York Times | 27 Dec 2018 |
| Radiation cleanup, briefly | ||
| Radiation cleanup, for short | ||
| Radioactivity cleanup, briefly | ||
| Raid rival | ||
| Purification process, briefly | ||
| Radioactivity cleanup process, for short | ||
| Raid rival |