Q. When washing hands with sanitizer on Yom Kippur, as we do in these pandemic days, can you wash your whole hand or only up to your knuckles, as we do when we wake up?
A. Horav Shlomo Miller’s Shlit’a opinion is that since one is not washing for pleasure, but just sanitizing as a medical precaution, one can wash with sanitizer as much as is medically required.
( See question 2861 above regarding the preferable liquids one may use during Yom Kippur for sanitizing hands)
Rabbi A. Bartfeld as advised by Horav Shlomo Miller and Horav Aharon Miller Shlit’a