Danm! You folks need to get a little further afield!
Best: (motorcycle trip) A Shell station on some side road in Holland where I would have been completely comfortable eating dinner on the floor. The place was nothing short of SPARKLING! Probably cleaner than when it was built. It was so clean, I actually looked behind the commode to see if it was all true. Yep, sure enough, sparkling too, looks like it was scrubbed with a tooth brush and Chlorox.
Honorable mention: The bathroom trailer at the Queen's birthday in Dam Square, Amsterdamn. Thousands of people using it, you paid the equavalent of about 50 cents Dutch and the guy would go in and polish each stall after use. Incredible. Also, the "self cleaning" public toilets in France that completely washed themsleves out after each use.
Worst: (work) The public toilet at Usinsk Airport in Russia. One of the guys working for me was one of those grizzled, hard core construction superintentants that had been around the world and seen it all. He came out of this particular bathroom and was completely SPEECHLESS. After some stumbling around, he finally said something about never having seen (or smelled) anything like it EVER before. I managed to avoid it for several months after that but finally had to succumb to "the pressure" and had to use it one day before a flight.
Weak of stomach should stop here.
It was a small cinder block building with three or so (I didn't study it carefully) stalls in it. The commode in each had been broken off at the base some time during the Jurrasic Period but, Noooo, that didn't stop anybody from taking a dump in the designated spot. So in each "stall" (the walls were busted down too) was a pile of **** over the original hole for the plumbing. Apparently, the trick was to point your ass flat out horizontal, or possibly with some arch, and project the "projectile" over the top of the pile so as not to have the loaf roll back down the heap and bump into your ankles. And, of course, there hasn't been any toilet paper since Stalin's days (if then) so the walls have a decorative display of **** streaks on them, in a pattern that suggests the dimensions of an outstretched splayed hand (yuck...). The "piss hole" was apparently where the urinals used to be as everybody seemed to piss in one select corner. The strangist thing about the place, and the worst, was the physical "presence" of the smell as you could feel the acrid stench stinging in your eyes and taste it in your mouth.
I didn't loiter there long.
You develope a method of completely shutting off your nostrils when traveling around the world.
Honorable mention: (motorcycle trip) The women's bathroom at the gas station/quick stop outside of Lost Maples in Texas. Wifey went in there and immediately came back out, couldn't do it. The commodes were full and overflowing, the stench was otherworldly. Really amazing as it's the only place for miles around Lost Maples to make a stop. You'd think they would take better care of it.
I've got other great stories if you care to hear them. let me know.