Perry, the DPD is a tool in the arsenal. It is great (fantastic actually) on Aluminum, and many other types of materials.
For example, the picture below is of a Deep Fry Basket that I got about 10 days ago...
It was so disgusting,,,, nooks and crannies caked with layers of grease and bits of old breading/coatings. Probably about 40-50 years worth, not to mention the dog hair...
Rinsed with super hot water, and sprayed with Dawn Power Dissolver, super hot water rinse and wipe over with sponge.
Sprayed a second time, minimal scrubbing...
And this is what it looks like now........
(no before picture...ugh... couldn't even stand to take a pic of the mess)