Related Clues:

• Scary signal
• Plea from the sea
• Castaway's call
• "--- yer old man!"
• Stranded traveler's signal, perhaps
• Seaman's "Help!"
• . . . — — — . . .
• Clorox cleaning product
• Tar's 'Help!'
• ...---...
• ''Mayday!'' relative
• Call in a calamity
• Urgent call at sea
• Brillo alternative
• Mariner's distress signal