I've read over and over not to wash the engine bay in my Old Jag. Apparently water and wonky British Electrics don't mix. I've resisted the urge to do it but I've got a slight leak that I want to track down. The engine bay is very grimy and caked-on with muck. I figure with ONR, Waterless Washes, and all the stuff available now that there has to be a way to do it. Any suggestions?