After a couple frustrating years of not getting consistently good accuracy with my black powder or duplex loads during the hot dry summer months here in the Arizona desert, I've decided give up on blow tubing and shooting dirty and go back to wiping the bore between shots for my two .32-40 rifles. 
For those black powder target shooters among us, is there anyone who can recommend a good water soluble lubricant that I can use to mix with water for damp wiping patches?
Thanks in advance for any help offered.

My second single shot rifle was a 45-70 Shiloh Business Rifle with a LONG throat/leade.  I worked up my best load using the NEI 349C bullet with a 'scraper' groove that I filled with lube (SPG).  Using Goex ctg powder I could regularly shoot sub 2" 200 yd 5 shot groups off the bench using an MVA tang sight.  I really regret selling that rifle.  I remember winning the 300yd match at Tacoma where sitting using cross sticks was the only position allowed and you had to have one hand on the sticks.  I shot a 97 3X to beat the best shooter at that time by one x. I used a blow tube exclusively.
That was the only rifle I had besides a trapdoor so I got very good at shooting it.