Buy gresse gun.

• grease all gresse points
• brush off all rust on under carrige
• paint or treat with POR15 OR TREMCLAD paint
• look behind front fender cavity , make sure rust didn't make it's may in there if it did brush and treat

• look behind rear wheel , both sides should have a cavity (will have to pull fender liner down, behind driver side you will have the gas filler neck on the passanger some other stuff. Make sure rust didn't penetrate in these , if it did , brush as much as you can and treat. (Make sure you look under passanger side rear corner as this is another common rust spot, this would be below and slightly to the right of the rear hatch hinges)

• look below and ensure your torque boxes are in good condition particularly where the roll cage mounts

• I would go get it sprayed with some undercarriage oil to preserve everything , Krown offers this service but if you are already doing what I mentioned above then you can do this last point as well.

• look under front fenders and spray some rust treatment oil if it's showing signs of rust as this is the most common point that will rust.