Use "Dry Lubricant" to clean it next time. It's part solvent, part lube, and safe for most finishes. Lube with real lube afterwards, though.

Or, if you need a more powerful cleaner, try Throttle Body Cleaner next time. It's like carb cleaner, but is safe for Teflon-coated throttle plates (most Fords require it rather than a carb cleaner).