What’s not to like?
Garlic is loaded with antibacterial agents.
The compounds in wine responsible for antibacterial activities are succinic, malic, lactic, tartaric, citric, and acetic acid.
And bile from a cow’s stomach strongly inhibits gram positive bacteria.
Between the three it is very likely that they would suppress the vast majority of external eye infections.
Don’t forget the brass container. Brass is an alloy of copper and zinc, both of which have antimicrobial properties. All those acids, brewing in a brass container for several days, would mean a significant amount of metal leached into the brew.