Waszyński went through Iran, Palestine and Italy with the Anders Army. He was lucky enough to be able to leave the USSR and find employment at the Film Section of the Martial Propaganda Office of the Polish Army in the USSR. He directed newsreels (e.g. Od Pobudki do Capstrzyku, Monte Cassino) and documentaries: Dzieci, Polska Prawda, M.P. Adama i Ewy, Wielka Droga. The structure of the film Dzieci (Children, trans. NS), dubbed Waszyński's testament by Samuel Blumenfeld, is particularly fascinating. The film is constructed like a weekly letter sent by a young soldier to his mother in Kovel. As Blumenfeld wrote:
It is a last goodbye from a man who was never to return to Poland. Waszyński never mentioned his hometown in any of his films or in any discussions; this film is the only exception.
Waszyński bid farewell to everyone and everything, starting with his parents, who were most likely sent to a concentration camp. Not long after, the director was making up stories about his aristocratic ancestors – in this light, Dzieci seems to be a work of art whose purpose was self-therapeutic. Through the protagonist of the film, Waszyński returned to his Jewish past.
From 1945 on Waszyński lived in Italy, working in the film industry. He was involved in producing Italian films and American motion pictures shot in Europe. In 1951, Waszyński co-operated with Mervyn Le Roy on Quo Vadis as consultant. The screen adaptation of the famous novel by Henryk Sienkiewicz was produced by Metro-Goldwyn-Mayer.
In 1946 Waszyński married Maria Dolores Tarantini, a widowed countess many years his senior. Tarantini died soon after the wedding, leaving a fortune and a palace in Rome to the director. An affluent man, Waszyński agreed to adopt the daughter of the actress Jadwiga Andrzejewska for a few years.