I use a bowl full of water, very hot thanks to a tea kettle. Then I cover my head by a towel in order to keep uttermost the heat and humidity.
Of course, it does not take a long time before cooling down, so I do several sessions of this, for a period of 6 min. I give pause for half hour at least and I restart.
-Also, you can do the same with a casserole of boiling hot water on the hot plate, it is even more efficient-
Approximatively, I would say that I do about 8 sessions by day.
-> But, I would like to add that it is necessary to avoid rubbing the lips to remove the 'flakes' when they are wet after a steam session but wait until they become again dry and cut with nailscissors, for example, the part of these flakes which seems to come off naturally.