Removing rust from chassis

[Wypipo]

The cross member on the back of my chassis has some rust. It?s right in front of the linkage. The cause was the mount for an SXS skid plate which is a metal hook that goes around the chassis that chipped the paint away. The rust spot is hard to get to, it?s on top of the bar under the motor. I didn?t plant on taking everything off the chassis this winter, any ideas on how to get to it and fix it? If I have to take everything off I will but didn?t plan on doing that until next year.