I clean the wheel barrels every time I clean the face of the wheels and tires. The Speed Master Wheel Brush is a good one I have domestic kind of bristle brush like that. And also the Wheel Woolies Spoke Wheel Brush which I get easier cleaning behind the spokes of the rims. Also if you want to have a high quality face wheel brush the Wheel Woolies one is awesome and very gentle.
Wheel Woolie Spoke Wheel Brush - 18 Inch
Wheel Woolies Boar?s Hair Wheel Brush
Lmao Rsurfer!
/ Tony