Sam Blackburn’s review published on Letterboxd:
Emily Blunt before she was Emily Blunt.
It is interesting seeing Emily Blunt in a role like this since all of the other movies I have seen her in she has played a character that is likeable here her character at first isn't the most likeable but as the movie goes on she does manage to become a more likeable person.
Amy Adams shines as she always does and Alan Arkin is doing what makes him Alan Arkin. We have seen this premise done many times two sisters who are different come together and manage to accomplish something.
While "Sunshine Cleaning" doesn't do anything to reinvent that formula it is still one of the movies that uses this plotline that works.