Thanks...Dr. Nitro for your tip about "Demon-Clean". Sorry...it was my mistake in not really answering the original question of what to use to remove BAKED ON CRUD. As you know, my suggestion of using an Alcohol and Ammonia mixture will do virtually nothing to clean-up baked on crud. My effort is to try and keep the crud off before it builds up.

On a side note, would "Demon-Clean" work to clean-up oil & carbon deposits on a lawn mower SPARK PLUG?
Sure...spark plugs are cheap, but I hate to do another ring job on the mower.

Thanks again!