Has anybody else tried Rejex?
I've been using it for about 6 months and it seems to work pretty well. Rejex is a wax-like liquid that you apply to parts of the aircraft that get dirty with exhaust or oil. It makes subsequent cleaning quite a bit easier. I've used it on my rear prop and horizontal stabilizer and it does work as advertised.
It's made by the CorrosionX folks and you can read more on their website at:
http://www.corrosionx.com/rejexscreen.html
It retails for about $20 per 16 oz bottle (not cheap), but Aircraft Spruce sells it for about $15:
http://www.aircraftspruce.com/index.php