What could be causing that green corrosion on my + pole. I already change the battery with a new one but it still having that green corrosion?

Your assistance is greatly appreciated
Thanks

 

It just happens. That's copper "rusting".
Scrub it off, dust it with baking SODA, and douse it with vinegar. Then rinse it off, and dry it.
You can get some battery grease in a little packet at the parts store, or use vaseline, or any dielectric grease sorta thing. Cover your pole, put your terminal back on, tighten it, and coat all visible metal basically.

If your + wire is old and frayed and whatnot, you may as well replace it.

 

This is what we do at the shop, and it does work... clean the terminals on the cables and the battery, put it all back together DRY, then spray the cable end/terminal with some 'heavy' penetrating oil - we like Fluid Film... it works great!

 

The corrosion is caused by acid seeping up the post from the battery.

Basically...listen to Sonix.

The reason that dielectric grease is a better option is that it actually will conduct electricity and prevent corrosion/rust (by preventing oxygen from getting to the metal).

Not that what Air_Adam is proposing wouldn't work...but it isn't the "ideal" thing. Kinda like using thermal paste on the ignition module...you want to use the paste, but dielectric grease works...just not as well.

HTH...

 

Sorry... should have been more clear lol... the grease is used between the terminal and clamp, the oil just on the outside of the cable clamp to keep the corrosion off it.