I have been using PB penetrating oil with pretty good success and forgot about Kroil until reading this thread. I'm going to keep my eye open for it and pick some up when I see it. Can you get it at Home Depot or Lowes?
I don't think I'm going to try the mixing it myself approach. Looks like there might be to many issues to deal with if I get it wrong. To me, it's not worth the effort to mess with it.
I love WD40 for cleaning. It gets nasty stuff off my hands better then anything else, and it's also great for getting glue off of glass. Really a great cleaner, but it leaves an oily film, so it has to be cleaned up with windex after using it to remove glues.
Eddie