Wheels
Doug, it's not worth the trouble to try to re-warp the wheels. Replacements are not too expensive, same with nozzle bumpers or other parts. As for washing the bags, that's easy. Once you have removed them from the Em-Tors, turn them inside out and vacuum the inner surface very throughly. Machine wash in cold water, not too much laundry soap, no additives like OxyClean or other. Tumble dry on low heat. The other trim parts should clean up with window cleaner and a kitchen sponge with a scrubby side. If you replace the brush rolls, I suggest four row double ball bearing type.
Justin