The few times I've needed to clean inside the wheel, a wire wheel on an angle head grinder did the trick. You'll need a twisted knot wire wheel, not a cup brush.

Good Luck,

RonR


RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5