Milk.
So with the products of the sacred cow, which are, as might have been expected, most valuable for this purpose. Hence the use of Ghilor or clarified butter in the public and domestic ritual. Milk for the same reason is used in offerings and sprinkled on the ground as an oblation. Cowdung, in particular, is regarded as efficacious. After the death or birth impurity the house is carefully plastered with a mixture of cowdung and clay. No cooking place is pure without it, and the corpse is cremated with cakes of cowdung fuel. Even the urine of the cow is valued as a medicine and a purificant. The cow guards the house from evil, and every rich man keeps a cow so that his glance may fall on her when he wakes from sleep, and he regards her as the guardian of the household.