I remove mine using a FW tool in a vice (no chainwhip needed).
Rest it, small cog down in a plastic tub and flush with WD40 through the gap between rotating parts. That will remove any dirt and old oil.
Let it drain for a while, then drizzel in bike oil through the same gap.
Thats all I ever do. The cogs wear out before the bearings.
Be careful when screwing the FW back on the hub, it's very easy to cross thread and damage the Al hub.