After two hours, many complaints, and several tantrums, one involving a crashed Comet Two Sixty and several broken teeth, Harry had found himself three Chasers: Katie Bell, returned to the team after an excellent trial; a new find called Demelza Robins, who was particularly good at dodging Bludgers; and Ginny Weasley, who had outflown all the competition and scored seventeen goals to boot.
There are no more uses of "comet" in the book.
Show samples from other sources
I look under the sink and find a dried-out Brillo pad and a can of Comet.
Lauren Oliver -- Before I Fall
Three of us had giant camping flashlights, the glow illuminating jarring images: It was suburbia, post-comet, post-zombie, post-humanity.