Stainless steel does not rust – just like our knives, forks, and spoons! When spots of rust are found on the sink’s surface, this is the result of foreign iron particles(from renovation works - Example: drill dust) rusting on it. A classic example is the rusty paper clip mark at the top left corner of our insurance documents (kept in the cupboard for sometimes). We won’t say that the paper is rusting as it would sound silly, right? ..... These rusty marks come for the iron paper clip rusting due to moisture in the air.