Strange blue liquid

Question

We have tipped our benchtop dishwasher on it's front in order to replace the drainage hose. There's a container behind a panel at the rear that has blue liquid which has leaked. I bought it through the trading post & didn't come with a manual. I've searched and searched on the internet but can't find any reference to it and can't see it on diagrams for other dishwashers.What is the blue liquid and is it imperative to the operation of the dishwasher?