You might want to be careful about using ammonia to clean your planes. If they are covered with Monocote, ammonia is able to soften the adhesive. A detergent or citrus based cleaner works just as well without that danger.

Hey Charlie P, it sounds like you had some fun stuff to play with for a while there. I know a few serious shooters who use 15% ammonia to clean the copper fouling out of their rifle barrels in the field. It only takes one pass for the patch to come out bright blue, and maybe 3 for them to start coming out clean. My father in law who works at a hydrogen peroxide plant has some neat stories to tell about his product in high concentrations too.