See also The Effect of Handwashing with Water or Soap on Bacterial Contamination of Hands by Maxine Burton, Emma Cobb, Peter Donachie, Gaby Judah, Val Curtis, and Wolf-Peter Schmidt (Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine)

wait, when there’s a sprayer people don’t use their hand? Gross! How do they know it’s clean of debris if they don’t even wipe it?

Also, if you spray up then that means the sprayer gets covered in poopy water. Gross!

I always aimed the sprayer at my back and wiped with my hand. It seems super rude to spray from below :(

Possibly helpful: if you go to the English wikipedia article for ALP, then you click “languages” and change to the “Español” version of the same article, it takes you to the Spanish version wikipedia article for ALP.

The information in that article may be helpful.