Blender part in dishwasher, poisonous?
It seems that oil has been driven out of the bearings.

For getting rid of oil contamination, soap is actually very useful. One or two empty runs should certainly get rid of what is left in the dishwasher itself, even if the oil is not food grade - otherwise, everyone running a dishwasher professionally would have to be worried about someone having eg touched a cup or plate with motor oil on his fingers.

Check if the bearing still runs decently; it might be best to take the bearing apart and re-grease it (this one looks like it is designed to be taken apart) - check whether you can find a repair manual and/or advice from the manufacturer on what grease should be used here.

If you use any non-approved type of grease, pay heightened attention when using the blender - any strange noises, smoke, slowing down... mean turn it off now.