How repair corroded relay box on caliber SXT 2007 low price?

To repair a corroded relay box on a 2007 Caliber SXT affordably, start by disconnecting the battery for safety. Remove the relay box and clean the corroded areas with a wire brush or sandpaper to eliminate rust. Apply a corrosion inhibitor or rust-proof paint to protect the cleaned surfaces, then reassemble the box, ensuring all connections are secure. If the corrosion is extensive, consider replacing the relay box with a used one from a salvage yard to keep costs low.