Learn the tone, meaning, and better English alternatives around "since when do" with real scene examples.

It means the speaker is questioning why this person is suddenly doing all the cleaning, often with suspicion or sarcasm.
From An Affair With My Boss, Episode 27
Someone challenges the other person about suddenly doing all the cleaning.
Use this in a tense or sarcastic conversation when you want to challenge someone’s behavior. It would sound unnatural in neutral, polite speech.
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