21.   Unplug the refrigerator and remove excess dust using the brush attachment on your vacuum cleaner, then clean the coils with detergent and a soft brush.

22.   When painting raw wood, first wipe the surface with a damp rag to remove dust.

23.   China has been improving the quality of the coal it exports by using equipment to remove dust for cleaner burning, it said.

24.   China has been improving the quality of the coal it exports by using equipment to remove dust for a cleaner burn, it said.