When was the last 'clean' Formula 1 race?
A 'clean' race is one in which all cars that made a time in qualifications ended the full race (they did not retire or receive a DNF or DNS).
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2 Answers
Just as an update to the previously accepted answer, which is from 2018, the last "clean" race as OP describes was the 2019 Austrian GP.
According to Wikipedia:
Verstappen's victory marked the first win for a Honda-powered F1 car since Jenson Button in the 2006 Hungarian Grand Prix. The race was also the first race in the season not to be won by a Mercedes driver, as Valtteri Bottas finished in third and Lewis Hamilton fifth. Antonio Giovinazzi scored his first ever career points in Formula One by finishing tenth place.[13] This also marked the first race in which every driver saw the chequered flag since the 2016 Japanese Grand Prix. (emphasis mine)
As of June 2018: the 2016 Japanese Grand Prix
Prior to the 2016 Chinese Grand Prix, only five races had finished with a full house. That list includes the 2015 Japan Grand Prix, where Felipe Nasr did not physically finish the race, but was classified after having run more than 90% of the total distance.
The 2016 Chinese and subsequent 2016 Japanese Grands Prix both had a true full house finish, 22 of 22 cars that qualified also finished.
Since then, the closest to a full house finish has been a single retirement from a qualified field of 20 and of 22.