Honestly, I don't think you can get it off. It will blend in, however, as the vacchetta develops its patina.
On a side note: as a doctor I'd advise you to get rid of the sanitizer. They are a big urban myth and don't do anything but ruin the leather on your bags
I don't think you can get it off. It will definitely blend in over time though--my son dropped a huge glob of hand sanitizer on my brand new Mon Mono NF and it got all over the handle and tab
It's very faint now--you have to look for it. I feel your pain!! Use it and enjoy it