Will the stainless steel refuse bin niche get rusty if there is a spill?

If a spill occurs on the stainless steel refuse bin niche, it may indeed cause to the appearance of rust spots, but this is not absolute and depends on various factors.
Firstly, the reason why stainless steel has corrosion resistance is mainly because it contains chromium element, which can form a dense oxide film on the surface to prevent moisture and oxygen from penetrating into the interior of the metal. However, this protective film is not indestructible and may be damaged for various reasons.
When a stainless steel refuse bin niche spills, if the spilled material is corrosive substances such as acid, alkali, salt, or contains chemical substances that can damage the surface oxide film of stainless steel (such as sulfides, carbon oxides, etc.), these substances may directly corrode the surface of stainless steel, causing damage to the protective film and cause to rust spots.
In addition, even if the spilled material itself does not have strong corrosiveness, if it remains on the surface of stainless steel for a long time, especially in a humid environment, it may promote the occurrence of electrochemical reactions, indirectly cause to the formation of rust spots. This is because oxygen, water vapor, and other impurities in the air react with metal elements on the surface of stainless steel, forming corrosion products such as iron oxide.