Related Clues:

• Comet competitor
• Theme of this puzzle
• Astronomer's sighting
• Hale-Bopp, e.g.
• Sophocles tragedy
• Trojan War figure
• Rival of Bon Ami
• Bon Ami alternative
• Its slogan was once 'Cleans like a white tornado'
• Kitchen cleanser
• Doomsday cause, maybe
• Warrior of legend
• Common cleanser
• Streaker in the night sky
• Celestial object