WordNet (r) 3.0 (2006):

delouse
    v 1: free of lice; "They deloused the prisoners after they
         liberated the camps"

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "delouse":
   antisepticize, autoclave, bleach, boil, bowdlerize, chlorinate,
   clean, clean out, clean up, cleanse, clear out, decontaminate,
   depurate, deterge, disinfect, dry-clean, dust, dust off, expurgate,
   freshen, fumigate, hygienize, lustrate, pasteurize, purge, purify,
   reform, sanitate, sanitize, scavenge, spruce, steam-clean,
   sterilize, sweep out, sweeten, tidy, whiten, wipe, wipe off,
   wipe out, wipe up