Source : Webster's Revised Unabridged Dictionary (1913)

Scavenge \Scav"enge\, v. t.
   To cleanse, as streets, from filth. --C. Kingsley.

Scavenge \Scav"enge\, v. i. (Internal-combustion Engines)
   To remove the burned gases from the cylinder after a working
   stroke; as, this engine does not scavenge well.

Scavenge \Scav"enge\, v. t.
   To remove (burned gases) from the cylinder after a working
   stroke.

Source : WordNet®

scavenge
     v 1: clean refuse from; "Scavenge a street"
     2: collect discarded or refused material; "She scavenged the
        garbage cans for food" [syn: {salvage}]
     3: feed on carrion or refuse; "hyenas scavenge"
     4: remove unwanted substances from [syn: {clean}]