"One should not abhor asking the simple folks whether a thing is a good remedy, as many drugs have been found often enough by plain people and by mere chance, rather than by planned scientific investigation." —Hippocrates "Father of Medicine."
Grandma's "Doctrine of Country Doctoring." If it burns like a coal of fire ... daub it on. If it taste so bad a buzzard wont eat it ... swallow it. If it stinks to high heaven ... wear it around your neck.