You can use carb cleaner on any of it, just don't mess up the shaft, it is a harden polished steel. Put a little lube on the shaft after you have it out and slide the new bearings on to make sure they are not too tight.
Lube the bearings with white grease when reinstalling, a little grease on the O-rings also. After I was done I poured a little motor oil down the oil passage, don't spin it much until it is in the truck and has oil pressure, simply rotate it to make sure it don't rub anything.
I had mine laying around for a year afraid to touch it, got bored one saturday and took it apart, thinking this is it???? Too easy. Be carefull with the E-clips they are the hardest thing to put back in, I replaced the inner clips, like to never got them back in, the outer clips are all that needs to be removed to change the bearings. ( the bearings have two snap rings holding them in place, just remove the outer one to replace the bearing)
Call J&H Diesel and they can get the parts for you in a couple of days.
Copy the turbo breakdown sheet off ATS web site it gives a nice how to place which part where view.