Tiny bearings and thin shims....
It is pretty hard but possible, question is why?
Instead you can pull it off of the hub with a 10mm allen and remove the rubber seal from the inboard side.
Soak that sucker and flush, then blow out any solvent spinning the freehub to clean the pawls.
You may need to repeat.
The body should feel kinda loose and sloppy at this point and spin very freely.
Here i usually take a small bead of Triflow grease(not lube, although i know a guy that uses Phil's Tenacious Oil for this) applied to the gap just above the bearing race and blow it in with the compressor and repeat on the other side, wrapping the thing in a rag so i don't blast myself with the blowback.
Very little grease is required and too much will prevent the pawls from engaging.
This can also make the hub silent, which is kinda nice actually.
Of course best solution is that the new ones are pretty reasonably priced for the peace of mind they provide.