Unplug the coffee maker and let it cool
Empty the water reservoir
Fill the reservoir with descaling solution (or a 1:1 mix of white vinegar and water) up to the max line
Place a container under the brew spout to catch liquid
Turn on the machine and start a brew cycle
Pause if the machine allows and let the solution sit for 15–30 minutes
Resume the brew cycle and run until the reservoir is empty
Turn off the machine and let it sit 10 minutes
Refill the reservoir with clean water
Run multiple brew cycles with clean water (until no vinegar/solution smell remains)
For machines with an external water tank, repeat rinsing until the output runs clear
Clean the brew head/spout area with a damp cloth if needed
Wipe down the exterior and reassemble any removed parts
Run one final brew cycle with plain water, then discard it
Plug the machine back in and use as normal