Super degreaser is stronger cleaning agent than apc . Yes u can Use it for enginebay. Under carrage . Wheels
U can Even Use it for interior in Mild ratio like 25;1 or 30;1 means 30 part water and 1 part degraeser for interior.
Difference is degreaser stronger than apc and also its having Anti rust oils So its End result very slightly oily where as apc End results dry surface
I experminet super degreaser for interior with 30;1 ratio and in last I give Warm water wipe with microfiber cloth to remove excess oils well don't be confuse with oils its extreemly less
Meguiars cleaner wax and Ultimate wash and wax shampoo avialable however apc finish