Changed Brake Fluid

Well changed brake fluid at mates garage. We bled all brakes and clutch to make sure all changed.
Everything ok.
Except clutch pedal now squeaking, it seems to be coming from the rod that goes through the bulk head. We greased this rod thinking it was prehaps the rubber gromit, but has not cured it squeak. Does this rod go into a piston/slave cylinder on the other side of bulk head and has anyone else had this and cured it.
Thanks