Peanut Butter works. If you want to use a "product", clean with APC or TAW (Griots has a great working wax buildup remover), and dress with AIO, Trim Detailer, Black WOW, or even opti-seal.
We did a Jeep recently and the side bars had build-up right where the fenders end, obvious carelessness while applying wax. It did not clean up with APC enough. But I used Meg's trim detailer in creme form pretty heavy, let sit for a few minutes, then followed up with Megs trim detailer in Spray form. It took care of the spots and residue, and left a very dark black trim piece.