I reality descaling the dishwasher really shouldn’t be necessary. The dishwasher softens (and hereby removes limestone) the water via the water softener.

Therefore: IF you need to descale the dishwasher, you should first check whether the salt level is set correctly.

Once limescale has build up in the dishwasher, you will need to descale it to remove the limescale build-up.

Here's how you do it:
1. Fill the detergent compartment
2. Run an empty wash at high temperature