keep something clean

I gave it to you to use, not to keep clean in your pocket.

We tell them that they have to keep clean, to shower.

Any hospital needs to be kept clean and the patients need good food.

As a result, both are rough and hard to keep clean.

And make sure that the surrounding area is kept clean.

And be sure that the flat leaves are kept clean.

This made the places difficult to keep clean and in good condition.

Unfortunately, it is probably also the most difficult place to keep really clean.

They are able to keep clean by not having feathers on their head.

They work just fine, but are a bit of a challenge to keep clean.