| Clue | Source | Date |
|---|---|---|
| Garage floor blemish | LA Times Daily | 29 Mar 2021 |
| Garage floor blemish | The Washington Post | 29 Mar 2021 |
| Stain on a garage floor | Newsday | 07 Jul 2019 |
| Carport stain | Wall Street Journal | 19 Dec 2018 |
| Carport stain | ||
| Driveway blemish | Wall Street Journal | 10 Dec 2015 |
| Garage stain | New York Times | 06 Aug 2015 |
| Garage stain | ||
| Garage floor evidence of an automotive problem | ||
| Driveway blemish | ||
| Garage floor stain | ||
| Garage smudge | ||
| Driveway blotch | ||
| Garage smudge | ||
| Driveway blotch | ||
| Slick | ||
| Garage floor blemish | ||
| Driveway deposit | ||
| Ceramist's ___ glaze |