Axle grease

"Hagrid was wearing his best (and very horrible) hairy brown suit, plus a checked yellow-and-orange tie. This wasn't the worst of it, though; he had evidently tried to tame his hair, using large quantities of what appeared to be axle grease."

- Description.

Axle grease is a petroleum-based substance used to lubricate wheel bearings.

Just before the Hallowe'en Feast in 1994, Rubeus Hagrid slicked his hair with a coat of axle grease in an attempt to tame it and impress Olympe Maxime. By next month, Hagrid seemed to have given up on the use of axle grease, although he still attempted to comb his hair — leaving the comb's broken teeth tangled in it.

Appearances

 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Goblet of Fire (film)