Rust and corrosion on the dishracks

I removed the bottom rack by simply rolling it out of the dishwasher, and removed (unsnapped) the rotating spray assembly. It was easily snapped into the center of the new dishrack. Next, I removed the roller stops from the rail holding the upper dishrack by following the marks (arrows) on the stops. I rolled out the upper dishrack, and rolled in the new one. Finally, I snapped the roller stops back into position.