Anti-oil

Multi-grade Anti-Oil was a red liquid used by the Tenth Doctor to clog machinery and gears. The Doctor used a wine glass of anti-oil to immobilise a Clockwork Droid on the SS Madame De Pompadour, captioning the oil with the phrase: "If it moves, it doesn't." (DW: The Girl in the Fireplace)


 * The Anti-Oil was probably found somewhere on the ship, as it's highly unlikely to have been on Earth in the 18th century.