You might have cleaned the bath after you’d used it. I wish you _______ the bath after using it. ?

The sentence "I wish you _______ the bath after using it" expresses a desire for a different past action. In such contexts, the phrase often includes an implication of regret or longing for something that did not happen.

Option A, "had cleaned," is the past perfect form, which is used to indicate an action that was completed before another past event. In this case, the speaker wishes that the action of cleaning the bath had been completed before the moment of regret (which is the present moment reflecting on the past). This construction appropriately conveys that the speaker is lamenting about the bath not being cleaned after use.

The other options do not suit the context appropriately:
- Option B ("cleaned") lacks the necessary form to express a regretful wish about the past.
- Option C ("would clean") suggests a future intention rather than a past action.
- Option D ("clean") is a simple present tense, which does not align with the past context.

Thus, "had cleaned" is the correct choice, as it effectively communicates the speaker's wish for an action that they hoped had occurred but did not.