It is generally recommended to avoid washing stainless steel and aluminum together in the same dishwasher run. This is because the two metals can react with each other, leading to a chemical reaction that can cause discoloration, pitting, or damage to the items.
Stainless steel is a corrosion-resistant alloy that contains iron, chromium, and other elements. Aluminum, on the other hand, is a soft metal that can be more prone to reacting with certain substances. When aluminum comes into contact with stainless steel in the presence of water and detergent, a galvanic reaction can occur.
To prevent potential damage, it's best to separate stainless steel and aluminum items when running them through the dishwasher. If you need to wash both types of items, it's recommended to run separate dishwasher cycles for each material or wash them by hand using appropriate cleaning methods for each metal.