21.   All wounds should be kept clean and watched for possible signs of infection.

22.   First, to keep clean.

23.   Gasolines at all octane levels are required by law to contain detergent additives that keep engines clean, she said.

24.   Hagy said most down comforters only come in white because they are usually covered with a duvet to provide color and to help keep them clean.

25.   He made his living doing maintenance work for a small aviation company, keeping an eye on the planes, keeping things clean.

26.   How can I clean the steps and keep them clean?

27.   How to keep grout clean?

28.   How can I clean it up and keep it clean?

29.   His tiny area reeks of rotting garbage, but he keeps it clean with scouring powder and steel wool.

30.   Home is where you keep clean, and away is where you pollute.