A little bit late with this, but I have also used the Kerosene in a pvc pipe.
The effectiveness, in my mind, is somewhat subjective.
Supposedly, at the time it was thought to make the rod a bit more 'limber', a bit more flexible, maybe.
IMHO, about all that ever come of that was a ram-rod that stank to high heaven until you finally tossed it and started using, and maintaining them with Linseed Oil.....a quick rub down with 0000 steel wool, and another quick rub with Linseed Oil seems to do the trick as well, and about as cheap, as anything I have ever tried.
And, FWIW, I also think the use of a brass ram-rod full time, without proper cleaning, is just as bad as a fiberglass, and many of those other "Bullet Proof, Break Prof" rods on the market......except, when you are trying to worm a ball out, then they shine right nicely.
BTW; Worming a ball out is the very reason God gave mankind the co2 dischargers, too many good christian folk who had never uttered a foul word, jut going by the wayside, or so I'm told.
Uncle Russ...