Clean hands are charming hands. Germ hands are gross hands.
Feces (poop) from people or animals is a main source of germs, which if not washed off, remain on our hands (e.g., from toilet, handling raw meat). Fecal matter shoots into the air when a toilet flushes (up to 15 feet) — called a ‘toilet plume,’ which can then be sucked into public restroom air dryers and blown onto hands.4 Even the average swimmer adds at least 0.14 grams of fecal matter to the water within the first 15 minutes of entering.6
1,000,000,000,000
germs can live in one gram of poop.
(That's the weight of a paper clip)