A friend of mine, sadly no longer with us, told me about some missions he flew in a Canberra sampling the atmosphere after a nuclear bomb test (presumably the 'sniffer' missions described above).
One thing he said which interested me was that when they landed after the mission he refused to allow his crew to disembark until the aircraft had been fully washed. This resulted in the crew having to sit in the aircraft in the sun for 1 1/2 hours or so. It did not make him popular at the time but when he did some checking relatively recently his crew was the only crew from his flight where they were all still alive.