A lot of people use naptha. You can use just about any solvent really...gasoline... I use wd40 by the gallon in a little parts washer,





as long as it's not something that's going to effect the plastic parts (safety first of course, and dispose of used solvents properly). Sometimes I use a little Marvel Mystery Oil to clean up bearings, and then re-lube them if they need it. You might have to let stuff soak a bit and maybe even take an old toothbrush to some of it.

Even though your bearings are new, I'd at least check them for free rotation, cuz like I said, lately I've seen a couple of savages that came brand spankin new with rusty bearings.