Yeah, PowerBalls are great -- whether it's the Mini, PowerBall 4Paint or the new PowerCone -- I have them all!
But the honeycomb is best cleaned by hand.
A similar idea I use is...
Before a regular wash, I'd simply mix up some warm car wash suds in a little container -- maybe even spray some on the area as a pre-soak -- and then clean with a split-end detail brush or a paint brush with the end trimmed a bit.
It should come out looking pretty clean.
When you finish washing the vehicle and drying it, I'd drape a few towels to "mask" off the honeycomb and then mist it with a solution of 1 part Mothers Protectant and 2 parts filtered water -- just a fine mist, and then let it dry. Buff off any excess protectant, and use an instant detailer or spray wax to clean up any excess on the paint.
I do this process a few times a year and it works pretty well.
If your vehicle sees a lot of sun, you may want to spray some Back-to-Black on it instead.
Your mileage may vary.