I buy a product from a local Chem company..... It's called 'ONE SOLUTION'.... My wife used it to clean the oven a few weeks ago. She said she has never used a product with no odor that cleans so well.... Only problem is, I'm in B.C. Canada.... Product is formulated/ produced in Kelowna... The company is called Concept Chemicals. The owner/ lead chemists name is Dave. He's probably 65-70, and he's probably one of the most intelligent person I've ever met. Call them, it's worth a shot.
Check Spartan Chemical. They have a line of products for food processing.
Pretty much anything you use isn't going to be completely food safe. When I worked in a super market all our departments used a degreaser made for food processing. I don't know what it was but it couldn't be sprayed when food was being prepped, had to be completely rinsed and the surfaces had to be thoroughly dry before they could be used again.