scavenge in WordNet English dictionary

1. remove unwanted substances from
   scavenge  clean 
   
2. collect discarded or refused material
   "She scavenged the garbage cans for food"
   salvage  scavenge 
   
3. feed on carrion or refuse
   "hyenas scavenge"
   scavenge 
   
4. clean refuse from
   "Scavenge a street"
   scavenge