Dishwaser works a treat. Put all my tuffs in the dishwasher, brings them up mint. Obviously won't bring faded ones back to life but gets all the shit out from inside the hub. Also, if replacing the bearing cups, put the cups in the freezer over night and as soon as you take the wheels out of the washer, fit them. They push straight in without having to hammer them in and damaging the hubs. Hope that helps. So, no the dishwasher won't damage the wheels.