Hi Les
The Enzyme based products you are looking for do exist. They are considerably different and a bit more specialised than chemical cleaners/degreasers and use a process called bioremediation. My company supplies a product called FPT-600 which is precisely what you are looking for, I already have in excess of 12 companies using it for kitchen, duct, and canopy cleaning. If you would like to find out more please contact me, I even have a video showing the product use if you require.
regards
Darren Sharpe