Swallows Scrubbing Condition
Method of scoring scrubbing results
| Description of bottom | Approx time to clean (minutes) | Score |
| Very little slime, cleans off easily | 10 | 1 |
| Moderate slime, not as easy to clean | 20 | 2 |
| Heavy slime, some black spot | 30 | 3 |
| Significant amount of slime and black spot | 45 | 4 |
| Lots of slime, extensive black spot, some weed | 60 | 5 |