Water-sol oil at machine shops
Machine shops use water-soluble oils. I believe you can find some at industrial supply houses--possibly NAPA, Auto-Zone, other auto parts shops.
I got mine ~25 years ago from a friend in the Fort Phantom Hill ThunderSticks Muzzleloading Gun Club. I believe he worked in a metal fabrication shop. Still have some as well as the mixture. Believe we mixed it about 1 part oil to 4 parts water. Added a little DAWN or JOY for extra cleaning action (used it to wipe the bore after each shot as well as a patch lube).
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