Sealed bearing.....if you have an issue you better start looking for a used replacement. There are no aftermarket replacements found yet (that are still in stock and purchasable)
Just spray it off with some brake cleaner. I had mine bead blasted without any damage to the bearings or seals, a little duct tape covering made it possible
Here are a few pics. The water pump and timing cover were done the same way, and they have about a 1000 miles on them. They are super easy to wipe clean yet, excuse the rest of the engine bay mess...still in mid process of this years upgrades