"Are you using water to clean the books and the bookshelves?"
"No Madame, just a damp cloth."
"And what made the cloth damp?"
Pregnant pause. Waiting for the lightbulb to go on. Still no light bulb. Big sigh on my part.
"Please only use a dry cloth or the duster to clean the bookshelves. The water will damage the books and the wood."
With a perplexed look "Yes Madame."
Any bets on how long before I catch her cleaning the books with a wet cloth again?