Owners must pay attention to the area around their eyes and mouth, this may need frequent cleaning.

Frequent cleaning of the engine was required to keep it in normal working order.

The screen will need frequent cleaning due to image degradation from fingerprints.

Frequent cleaning of the engine was therefore required to keep it in proper operating condition.

Frequent cleaning and airing, especially in hot, humid weather, are also important.

If you opt out of carpet, however, note that hard surfaces require more frequent cleaning.

Then too, the turnstiles may need more frequent cleaning.

They told others that the battle against repeated tagging required equally frequent cleaning.

Frequent dry cleaning, the experts agree, actually may prolong a garment's life.

You may need frequent dental cleaning and examinations until the disorder is cleared.