I have been flying to foreign countries more than 60 times.
But I have been having little experience of a big trouble.
I believe that I owe it to cleaning.
After using a toilet of the airplane, I always clean it with paper.
Such a little consideration keeps the lavatory clean.
As I often go to the toilet, it is always clean.
It makes our travel happy and safe to clean a toilet of the airplane.
(I don’t know why.)