Rust on metal utensils after using the dishwasher can occur for several reasons. First, it could be because the cap of the softener was not tightened securely, allowing the dishwasher salt solution to spill out. Ensure the cap is tightened properly to prevent leaks. Second, spilled dishwasher salt that was not cleaned up during refilling can cause rust. Always wipe away any spills immediately to avoid this issue. Third, the utensils themselves can be made of materials prone to rusting, which is unrelated to the dishwasher’s performance. To minimize rust, use high-quality stainless steel utensils and ensure proper drying after washing for optimal care.