Alkyl or Alkenyl Polyglucosides: ##STR4## wherein R is a straight chain alkyl or alkenyl group of at least 12 carbon atoms, preferably at least 16 carbon atoms, more preferably at least 18 carbon atoms, and most preferably at least 20 carbon atoms; or an aralkyl or aralkenyl group of at least 14 carbon atoms, preferably at least 18 carbon atoms, and more preferably at least 22 carbon atoms; and n=