I've used the anti-freeze technique on two engines (Thunder Tigers) and it works great. However, one of the other members in my club had disastrous results.

He used a crock pot with a ceramic pot and undiluted antifreeze on an Enya engine. This engine turned dark gray! Another member who was present said that he used to use electrosol in a dishwasher (when his wife wasn't home!) to clean his engines, but when he tried to clean one of his Enya engines, the same thing happened, his engine turned gray!

Is there something in the metallurgy of Enya engines that is causing this to happen? Does anyone have experiences with other manufacturers engines