In the old days, perhaps due to lack of knowledge of hygiene of the crowning glory, infestation by lice was quite common.
A cousin came back from school one day, scratching her scalp non-stop. By the third day, her sister and her mother were also affected. Things came to a head, when they discovered some tiny whitish creatures clinging onto their hair.
Fortunately, Grandma had a secret weapon, called the Sikat Kutu. She ran the formidable fine-tooth comb through the tresses of all 3 ladies — one swipe after another, and many lice were exposed, dislodged and summarily quashed.
But that was not enough. Kerosene was rubbed onto their hair to make sure there were no living remnants. Other folks even used a very pungent antiseptic white powder.