Are you the proud owner of a Delonghi Magnifica coffee machine? Then you are very lucky: the descaling is very simple!
It basically has only 4 steps:
1) Remove the water tank and take the water filter out. Add 100ml descaler (lime scale remover) and 1 liter clean water to the tank;
2) Press the descaling button for 3 seconds, place a large bowl under the steam nozzle and turn the switch;
3) Turn the switch back as soon as the light indicates that the machine is ready;
4) Empty the tank and fill it with clean water and again turn the switch.
The machine will now flush and after that is the descaling ready!
There are two different descalers suitable: Eccellente Quick Bio descaler or the Delonghi Ecodecalk mini
This video will give a full descaling manual: