What do I do when I have accidentally put diesel in my AdBlue tank?

Do not start your engine! Even the slightest drop of diesel will pollute the AdBlue in your tank. One drop of diesel will pollute up to 20 liters of AdBlue. Running with polluted AdBlue will disrupt your Selective Catalytic Reduction (SCR) system. To prevent further damage to your vehicle, it is best to contact your vehicle manufacturer. You may need to replace certain AdBlue components.