I have been trying out using a 2 gallon deck sprayer with Qew. and 1 bucket with a small amount of Qew in it for rinsing the mitt. I pre-soak the panel with a little shot from the sprayer and then use a chenille covered mitt dipped in the rinse water, then wash the panel, rinse, repeat on next panel. I find that the sprayer has enough pressure to get the wheel wells clean (after letting an APC dwell for a while) and drying with a terry towel. This also works great for spraying off a wheel cleaner and drying with a terry towel.
This has worked better for me than trying to get in the wheel wells with just the QEW solution on a mitt or on a brush.