The analogy used in the second stanza to convey the theme that "hard work is good for the soul" is:
D - Washing clothes is said to be able to wash away all of our bad thoughts of the week.
In this stanza, the speaker expresses a desire to wash away the "stains of the week" from their hearts and souls, suggesting that the act of washing is not just a physical task, but also a metaphor for cleansing one's mental and emotional state through hard work.