It can be an unpleasant surprise if you are emptying your dishwasher’s cutlery basket only to spot brown discolouration on knives and forks – or indeed anywhere in the appliance. Don’t worry, though, it is a common problem and can be easily fixed. These kinds of stains are not a sign that your cutlery is going rusty, says a German industrial association, the Industrieverband Körperpflege- und Waschmittel (IKW). The brown stains can have various causes. Often they are due to rust film from other items in your dishwasher. Here’s how to avoid the discolouration: \- Only put dishwasher-safe cutler…