Our nurse at school tells the kids to sing Happy Birthday twice, I guess that's the same idea. She also has this awesome (though admittedly gross) video that shows the kids how their germs spread. It's in cartoon format and really grosses out the kids, but it helps. I'll have to ask her for the name of it and then I'll pass it on.

Hey, my mother had my sister and me cut out toilet paper seats from newspaper before every vacation.  I know that's not the same thing as washing hands, but we overdid everything.  She was a stickler for hand washing and not touching anything dirty.  We washed our hands until they were pretty much raw, and my sister once brushed her teeth so long that even the dentist told her it was too much.  I agree that kids are seldom given enough time to wash their hands at school, and many times there is no soap available.  Even in the teachers' restroom, hot water and soap are often not available.  

I was also told that if a restaurant doesn't have hot water in the restroom, it's best not to eat there.  Sorry if I ruined salad bars for you.  Just think of all of the sneezes.  Oh, no.  I'm starting to sound like my mother.

We sing the "Happy Birthday Song"--it's shorter and it still gets their mitts clean.  But I can't live without hand sanitizer--trust me, I use to teach science to my whole school. We did the hand bug hall of fame tour.  I would douse them from head to toe if it wouldn't sting :)

I like the idea about singing a song to get them to wash longer! If the ABCs is too long, maybe a shorter song would work (?).