I don't believe that you'll get a problem when you use soap (dishwashing soap??) to dissolve the grease. The issue occurs when you rinse with water. The bearing will be clean enough.......for sure.......but you run the risk of leaving water within the rollers unless you thoroughly blow dry the rollers.........not all that easy to do.

Will the residual water cause damage to the bearing over the long haul???.............probably not........but.......seriously........you don't want it there if you can avoid it.

Just rinse them in acetone, or brake cleaner........one time........after your soap and water cleaning process........to get rid of the residual water.

Edited: Roy mentioned another reason to me via PM as to why water is undesirable. If you leave a bit of water in the hub, and the hub exceeds 212F. for any reason (heavy braking causing a significant temperature rise), the water is going to flash to steam and possibly damage the seals when it escapes the hub.