denatured:

(2) Of alcohol made undrinkable, by adding a toxin or unpalatable substance, but still useful as a fuel or solvent. Traditionally by the addition of methanol (wood alcohol) to ethanol (grain alcohol).

https://en.wiktionary.org/wiki/denatured

seems like there should be more information here, but I didn't look

https://en.wikipedia.org/wiki/Denatured_alcohol

Wait, shouldn't hand sanitizer food-grade? Wouldn't making it poisonous be very dangerous?

only poisonous in quantity, small amounts like from your hand would be tolerable. We just don't want alcoholics drinking a whole bottle to feed their addiction and then winding up blind.

In the US, hand sanitizer must be mostly ethanol or isopropyl alcohol. They're denatured to make unsafe for consumption and avoid certain classes of taxes on alcoholic beverages.