I've spoken with a few guys in the South who do this , you dig a shallow hole and pour a cup of bleach in it and cover it up . The bleach reacts with the soil and produces sodium as it catalyzes with minerals in the soil . Deer crave sodium and dig up the soil and eat it . They said that there was no ill effect on the deer because the bleach is nuetralized in the process before the deer can smell the lick . Bleach is a dilute solution of sodium hypochorite , when neutralized it becomes a salt . Consult your state's laws on baiting before using this method during a hunting season .