Anti-oil



Multi-grade anti-oil seems to be, by it's name and it's affect on the Clockwork Droids, a sort of liquid that stops or clogs machinery and gears. Generally the opposite effect that oil has on machinery.

History
The Doctor used a wine glass of Anti-oil to immobilize a Clockwork Droid on the SS Madame De Pompadour, captioning the oil with the phrase: "If it moves, it doesn't."