I started out by presoaking wheel well with Meguiar’s APC+ 4:1, and agitated everything with a dedicated Meguiar’s Slide-Lock Brush.
The inside of the brake calipers were not forgotten.
Once those were cleaned, I tackled the control arms using the Meguiar’s APC+ and some #0000 grit steel wool.
After a couple minutes of some hard scrubbing, the entire wheel well was rinsed down and Chemical Guys Trim Shine Protectant was used to restore the black finish on the fender liners.
Once all four wheel wells were cleaned, I proceeded to clean the wheels.