| be cleaner | 9.28 | It is cleaner. | ||
| get cleaner | 1.58 | Why is accounting getting cleaner? | ||
| burn cleaner | 1.32 | Natural gas burns cleaner than coal. | ||
| become cleaner | 0.79 | Buses have also become much cleaner. | ||
| look cleaner | 0.46 | Her hair looked cleaner. | ||
| feel cleaner | 0.26 | You feel cleaner. |