On Mon, 4 Jan 2016 20:57:19 -0800 (PST), Andy
wrote:

I am trying to clean some over spray of an oven. (Not my work.) :-)

For piffle dust, I recommend Amway Piffle Remover


As a former chemist, I have tried:

1. Paint thinner
2. TSP
3. Rubbing alcohol
4. Brillo pad (lightly)
5. Ammonia
6. Exorcism :-)

Any other ideas ?

Andy