Steamers actually do a pretty good job on certain parts of the kitchen.Was just going through my alerts and saw that you tagged me Mike. I wouldn't use a steamer for kitchen degreasing, you would be there for weeks.
I was gonna explain what we would do when I used to manage a 10k sqft commercial kitchen but I would be repeating what Dave just said above. Diluted oven cleaner, turn on the fryer and let it sit for a bit, will come right off, make sure to rinse, rinse, rinse.
Potassium Hydroxide, Sodium Hydroxide is the answer to all grease related things. Nothing I haven't been able to degrease with it just yet.
Might also kill me at the age of 35...
Prez cleaning is in hiding?