What is J-Lube, really? (A more technical view)
Note: It's possible I'm way off base with some of this information, but I'm pretty sure it's correct enough for the purposes of this page. However, if you know better, please contact me and let me know. But be prepared to have actual evidence handy. I've gotten tired of people e-mailing me complete and total crap that has no basis in reality just because they believe the magic lubricated butt fairies make J-Lube work, not science.
J-Lube is basically two things; a polymer (polyethylene oxide) and a dispersing agent (sucrose). The real work is done by the polymer, the dispersal agent is just there to make it easier to measure out and mix. You'd be using a mere 25% of what you normally use if there were no dispersing agent, and given how J-lube likes to clump when it gets wet, if you didn't have the dispersing agent it would turn into one big clump when it hit the water.
The polymer is sort of like a piece of string. When it's dry, it's all bunched up and acts as a generally useless lump. Keep in mind, of course, this is on a microscopic scale so to the human eye those useless clumps just look like white powder. When you get them wet, they spread out and are no longer bunched up. Now they act like long little threads floating around in the water (although technically, from what I have read, polyethylene oxide will bond with the hydrogen in water so it's not so much "floating" as it is actually stuck to the water molecules, and the long "strings" are actually polyethylene oxide that is hydrogen bound to water, which is then in turn hydrogen bound to even more polyethylene oxide, resulting in a collection of these water/polyethylene strings). They'll stick to each other, but there's still water in between them so they can slide apart quite easily, albeit in a somewhat snotty fashion. Think of it like a pot of pasta. When there's a lot more water than pasta, it flows easily but has some long, stringy bits in it that slow things down. Reduce the amount of water, and eventually you've got nothing but pasta in one big clump. This is what goes on in technique two of the "mix it just before you use it" recipes up above, by the way. This is also why using a blender isn't such a good idea. You want all those long water/polymer threads in there, and whirring them around and chopping them up just makes them into much shorter threads, sort of like if you blended up your pasta. As you will see, you want those threads to be nice and long.
So now that you've got a mixture of water with all these microscopic strings floating around in it, how does it lubricate? Well, those strings will get between two objects that are rubbing together and cover it quite effectively. The end result is that now those two objects are no longer rubbing together directly. Instead, they're rubbing against the polymer threads, which are in turn rubbing against more polymer threads. Those threads slip and slide against each other much more easily than would the two lubricated objects if they were unlubricated and rubbing directly against each other. Skin is designed to use friction to its advantage... that's how you are able to pick up objects. There's lots of tiny little cracks and valleys that increase the surface area of your skin, thereby increasing the friction. But, if those areas are clogged up and covered by microscopic threads, they can't grab a hold of anything. This is how lubricants in general work, by the way. So why, then, is J-Lube so much more slippery than, say, another lubricant such as mineral oil? Because of how these tiny threads work. They can lay across the tiny cracks in your skin, and refuse to move out of the way or get sucked deeper into the cracks. An oil can get wicked up by your skin and won't have the viscosity necessary to withstand something your skin was designed to do... work its way through slippery things so that you can grab them. Shorter threads will more easily push out of the way as the pressure between two surfaces increases. But when the threads are very long, and there's enough of them so that you can't "push through" the barrier made by those threads, you have a recipe for a very slick lubricant that stands up very well to a surface designed to work its way through liquids in order to find some traction.
J-Lube, in a sense, takes its cues on how it functions directly from nature. What's one lubricant naturally made by the human body? Mucus, also affectionally called "snot." Which, by the way, is basically a bunch of cells (which aren't all that unlike the polymer in J-Lube) suspended in water. There's some salts in there as well, but that's sort of beside the point for the moment. The main thing is, it's a mixture very similar to J-Lube in how it functions. Which is one of the reasons why J-Lube does its job so well. It mimics the same lubricants that a human body produces, which are very much designed to make the body slippery.
Of course, the cells in mucus can be broken down more readily by your body should it get lodged somewhere it shouldn't be, which is where the issues with J-Lube in the peritoneal cavity come into play. Fortunately, as long as J-Lube is in a part of your body made to wash out foreign matter (rectums and vaginas do a good job of this, plus we can help them along if necessary) it's not such a big deal. But if it's trapped inside your body, and your body attempts to pass it into the bloodstream and through the kidneys, you would be in for a world of pain (and probably death).
Being that J-Lube is all about hydrated polymers, it's my belief that the reason salt does such a good job cleaning it up is not, as stated on sites like jlube.net, because it "breaks down the molecular structure" of the J-Lube. Rather, I think it's much simpler than that; the salt pulls the water out of the polymers, effectively dehydrating them (sort of like putting salt on a snail). I finally got around to testing this hypothesis a bit, and my tests seem to have proven it to be true (although I am right now rethinking and retesting that hypothesis, I will post results as soon as I have them). I took a thick batch of J-Lube, mixed in a healthy helping of salt, and let it sit for a couple days. This caused the J-Lube to separate away from the water, leaving an even thicker layer of J-Lube floating on top of some extremely salty water that had no lubricative abilities left to it whatsoever. The top layer of J-Lube was now almost glue-like in its thickness, and it would form long strings that would dry into whispy threads almost instantly. The two layers were so uninterested in each other at that point that the bottom layer of salt water could be poured away, leaving just a clump of J-Lube. So it stands to reason that salt works as well as it does because it dehydrates the J-Lube, but it does seem to also provide an abrasive effect to scrub it off of the skin.
Glycerine soaps seem to break up J-Lube as well, but from what I know of glycerine (which is a humectant) and from what I've seen of washing with glycerine based soaps it seems to work in the opposite manner from salt. It appears to actually over-hydrate the J-Lube, diluting it down and washing it away. I'm guessing the reduction in surface tension of the water (since it's a soap) also helps, but there does seem to be a definite "charging" effect that comes with glycerine soaps. In fact I have seen cases where what seemed like clean body parts suddenly became slippery with J-Lube after the glycerine soap hit them, like there was a small amount of residue left behind by other rinsing methods that wasn't enough to do much in the presence of plain water, but with the glycerine it actually began to work again. This is totally a hypothesis based on anecdotal information, however, so I wouldn't give it much credit. Still, glycerine soaps do seem to wash it off better.
Anyhow, the only real point that should be taken away from all this rambling is that the nature of a batch of hydrated J-Lube is that of a bunch of water with a lot of microscopic polymer threads floating around in it. Once you understand that, it's easier to understand how it does what it does, and how it's going to behave if you use (or abuse) it. Especially when it comes to mixing up your own custom version, as certain things will work better than others. The J-Lube might work as an emulsifier, which would help keep things like oils (and Crisco) in suspension, but at the end of the day what you've got is still a bunch of water made thicker by a lot of little floating threads. Being truly successful in your experiments is a lot easier once you begin to understand the limitations of the substance.