I say, and with God's success: The leftover water of camels is pure and purifying for ritual impurity, as it removes real impurities from clothing and the body, and it removes ritual impurities, which are minor and major impurities. It is permissible to perform ablution and bathing with it; because its saliva is derived from its flesh, and its flesh is pure. This is unless it is a jallalah — meaning it eats filth, which is originally dung — in which case its leftover water is disliked. The same ruling applies to the leftover water of every animal whose meat is permissible to eat, such as cows and sheep. Refer to: Al-Maraqi, p. 29, and God knows best.