If your 6030 is similar to my 5530 I removed the side panels, grill guard and then the front grill. Disconnected the head light connections while I removed the grill. Battery well is now exposed. Did all this to attach a electical supply to a control unit for a 350 gal 30' boom sprayer.
thanks i figured it out was'nt as bad as i thought, it only had corrossion on posts cleaned with coca cola used distilled water to rinse,and sprayed wd-40 afterward.
Buy dielectric grease and use that. They have small packets at Auto Zone and similar stores. It's designed to be used in "exposed" electrical connections to prevent corrosion. Also a good thing for vehicle head and tail lights, especially in a salt laden area like yours.
You can also buy a larger container that will probably last years. Just remember never to mix up the regular and dielectric grease. You don't want to use it on non-electrical stuff because you can make a low-level "battery".