No need to! Pre-rinsing is a thing of the past. And although many British households do it, it’s time consuming and wasteful of precious resources. Modern detergents such as Finish Quantum Ultimate contain both bleach and enzymes and are recommended by dishwasher manufacturers for use without pre-rinsing.Bleach fights tough stains like tea and coffee, and enzymes breakdown proteins and starches. All you have to do is scrape the larger pieces into the rubbish bin and load your dishwasher.