This photo is a toilet of a convenience store in Japan.
There are close to 50,000 such convenience stores in Japan, and most of them has clean toilets like this can be used.
It is free of charge for use, of course, consumers are not required even to buy goods in this store.
Then, in a poster in the toilet wall , are written as follows.
"To our customers.
Thank you very much to use it clean, anytime."