Bala.... ATF (Automatic Transmission Fluid)....
Undo the Starter... cut off a used oil bottle about 3" high from the bottom... fill it a little over half way with ATF... then stand the starter up into it, with the gear/shaft into the oil (let soak - the longer the better)... (The only trick is supporting it so it doesnt fall over... I clamped mine into a small vise which worked well and supported a small oil resevoir)
Once its well submerged leave it for at least 24hrs... when ready take it out, wipe off all the oil and re-install it.
I left mine in for a few days and once a day i pulled it out and gave the gear a good spin at the end
One big piece of advise to get the bottom of the two bolts undone on the starter... get yourself a couple of long 1/2" extensions and undo that lower nut from access next to the alternator from within the car (have to remove the little hatch behind the seats) it makes life so much easier.
Heiko