Mike - I use and have used it and other oils & greases. In the .69 with it's big loads and low pressure, 100% Neetsfoot oil works fine, but as Taylor indicated, it is not as 'slippery' as other lubes. Tracks mink oil, I find quite slippery in comparison, but the Neetsfoot oil is easier to apply to the patches - pour it into the container of pre-cut patches until they soak it up, squeeze the excess back into the can of oil - done.
I prefer to use the water based lubes for trail walks, but the alcohol/water/oil mix is a LOT colder on the fingers, than the oil, when temperatures plummet.
With track's mink oil, heating is required to soak a stack of patches, then when they are squeezed out - the Mink oil is thicker, slipperier and messier than Neetsfoot oil, but it sure works well. After a day's shooting with the .32 for a day and the mink oil, the last shot loaded, loads easier than the 1st one down a clean, but dry barrel. The WD40 I put in there after cleaning has dried, thus the barrel is not lubricated as it seems to be after firing.
That said, I have not found cleaning with cool or cold water to be any different, whether using Neetsfoot Oil, Track's Mink Oil or WWWF on the patches for shooting. The last shot fired leaves very little oil or grease in the bore. The fouling is just barely soft. There is NO oil or grease film needing oil-cutting-solvents for cleaning. There is no oily film in the fired tube - just 1 shot's worth of fouling, that actually dries out in a few minutes time, whether using oil, grease or water as a lube.
Taylor has found the same - cleaning with tap water as normal results in a clean barrel.