I don't know that one but I know that hydrogen peroxide 3% stuff you get from the drug store, will disinfect your countertops and appliances. Just put it in a spray bottle. As far as your question, I would say it's probably the vinegar.
I'm pretty sure it was alcohol. I have been buying some products from a distributor of some of Hulda's forumulas and she told me to use 50% water, 50% vodka. (I asked if gin was okay since I had a few bottles around and she said that would do too). Boggles the mind does it not!