No particular observations for this simple operation.
You need less than a liter of white vinegar.
This percolator became too slow, partially clogged by scale.
1- The scale can be seen on the cover's hinge.
4- Add as much of white vinegar until full capacity is reached.
7- Put some vinegar on a kitchen towel and clean the surroundings by hand.
2- The scale goes all through the tube that brings water to the filter.
5- Turn On the machine.
8- Refill with drinking water for at least half the capacity and run a new cycle for removing the vinegar taste.
3- Fill half the capacity of the percolator with drinking water.
6- Wait until the cycle completes.
9- Now the tube is clean like the cover and the percolator is fast again.