OK Tim you got us to bit, what fuel is he using?
Awww. You know, everything I said was perfectly true. If anyone got the notion that he was actually using soap in his engine that was just from reading between the lines.
Fuel is Sig Champion. 10% nitro (I think) and 25% total oil. He broke the engine in on all-castor, and now uses half & half. It works great, when we can remember the recipe for a one-flip start on an inverted ST 51. The Dr. Bronner's Magic Soap container is just because it's a nice 1/2 gallon jug that fits his flight box.
I should have included the shot of the liquid fertilizer bottle, too.