Avoid abrasive tools such as steel wool and hard sponges. They can cause scratches and leave particles on the surface that will rust over time. Rusted particles will stain the surface and can be difficult to get rid of (source).
Disinfectants such as chlorine bleach should always be avoided with stainless steel. The abrasiveness of the bleach can quickly erode the top layer of the metal and increases the risk of rust (source).
When cleaning stainless steel surfaces, it is important to rub along the grain. Don’t use circular motions as this can create small scratches.