Why? Because they are washing their feet instead?
>> washing their feet instead?
As a B-707/DC-8 pilot in Africa, one of our biggest contracts was flying the Muslims to Saudi Arabia for the Hajj. Since many of them came “out of the bush”, and had never seen a Western toilet (not to mention an airplane), the flight attendants had to repeatedly enter the lavatories and partially fill the sinks with water. If not, they would do their ritual washing with “blue water”.
(And yes, it’s true - someone once attempted to build a fire on the floor in order to heat their tea.)