“Filch’ll have me there all night,” said Ron heavily. “No magic! There must be about a hundred cups in that room. I’m no good at Muggle cleaning.”
“I’d swap anytime,” said Harry hollowly. “I’ve had loads of practice with the Dursleys. Answering Lockhart’s fan mail... he’ll be a nightmare...”

Harry Potter and the Chamber of Secrets - Chapter 7 : Mudbloods and Murmurs
See this quote in the Pensive -