I assume you are aware that this is no small problem.
Asian toilets are violin shaped porcelain bowls in the floor that one straddles and squats over.
Many folks . . . not thrilled and gahgah over all things western . . . think . . . that . . . uhhhhh
business is conducted more . . . uhhhh
flowingly and more anatomically functionally that way.
Without proper instruction or merely because they prefer squatting, the left position is one many take . . . with dreadful consequences for the next user, quite often.
They are loathe to clean up after themselves . . . that’s . . . beneath them in more ways than one.
If they squat over the toilet, what do they do with their pants - take them off completely? This must be difficult for women wearing panty hose.