After 2 hours debating myself whether I should have shower or not I finally did and I felt so good and way much better though cold. Just after my shower I had to jump into my -20 degrees C sleeping bag to be warm. Just for the record it was 4750 metres (15780ft).
Half way during trekking today part of the group discovered that their drinking water was contaminated with kerosene / diesel. Mine wasn’t as I had filled my bottles the previous day. They had to dump the water. They are ok no one got hurt!