I just cleaned the corrosion off of mine with the old baking soda and water treatment. The plating on the terminal was suffering so I sprayed it down with that purple anti-corrosion battery coat you can buy at the parts store. put a couple of pennies next to the + terminal for good measure.
When the original battery dies, I'll probably buy a $60 wet cell replacement.
Did your oem battery kick the bucket already? seems like I have never been able to get more than 4 years out of any of my first oem batts.
2005 OR 6-speed