Lice

Cook four sprigs of rue leaves in a liter of water for 10 minutes. Wash your hair with this water. Wrap your head in a towel and leave for 2 hours, then patiently remove all traces of the parasite.

Another option:

Chop 5 avocado pits and boil them for 20 minutes in a liter of water together with two sprigs of rue. Wash your hair with this water. Wrap your head in a towel and leave for 2 hours, then patiently remove all traces of the parasite.