| Share | Phrase |
|---|
| 9.39% | clean gas [perform operation] |
| 6.34% | clean by switch |
| 5.03% | catalyst [does] clean |
| 4.43% | cleaner [does] clean |
| 4.27% | clean surface [perform operation] |
| 4.22% | clean air [perform operation] |
| 3.95% | converter [does] clean |
| 2.97% | toluene [using as instrument] clean |
| 2.50% | clean cylinder [perform operation] |
| 2.38% | clean system [perform operation] |
| 2.36% | clean windshield [perform operation] |
| 2.28% | clean component [perform operation] |
| 2.20% | clean injector [perform operation] |
| 2.09% | clean pane [perform operation] |
| 2.06% | method [does] clean |
| 1.96% | clean engine [perform operation] |
| 1.83% | clean chamber [perform operation] |
| 1.63% | maintain [temporal] clean |
| 1.55% | clean modal can |
| 1.55% | filter [does] clean |
| 1.55% | clean reactor [perform operation] |
| 1.53% | clean radiator [perform operation] |
| 1.52% | clean oil [perform operation] |
| 1.46% | clean deposit [perform operation] |
| 1.45% | clean filter [perform operation] |
| 1.37% | clean canister [perform operation] |
| 1.37% | clean in passage |
| 1.24% | relate for clean |
| 1.22% | system [does] clean |
| 1.20% | periodically [temporal] clean |
| 1.18% | clean in gas |
| 1.17% | gas [does] clean |
| 1.12% | ability [does] clean |
| 1.09% | clean fuel [perform operation] |
| 1.02% | clean detector [perform operation] |
| 0.99% | clean to operate |
| 0.98% | clean nozzle [perform operation] |
| 0.92% | clean drum [perform operation] |
| 0.87% | effectively [degree] clean |
| 0.84% | effect [does] clean |
| 0.83% | so [resume] clean |
| 0.82% | easily [manner] clean |
| 0.78% | clean port [perform operation] |
| 0.72% | clean area [perform operation] |
| 0.66% | clean modal should |
| 0.64% | device [does] clean |
| 0.62% | clean housing [perform operation] |
| 0.61% | apparatus [does] clean |
| 0.59% | relatively [degree] clean |
| 0.55% | clean line [perform operation] |
| 0.55% | clean passage [perform operation] |
| 0.55% | clean part [perform operation] |
| 0.51% | clean element [perform operation] |
| 0.51% | not clean |
| 0.45% | clean modal may |
| 0.44% | clean portion [perform operation] |
| 0.42% | means [does] clean |
| 0.38% | time [temporal] clean |