Which of these household name products was originally invented for a completely different purpose than what made it famous?

Throughout history, some of the world's most successful products began as something completely different! Many inventors and companies pivoted their original product concepts in ways that unexpectedly revolutionized industries. This trivia question explores one of the most fascinating product innovation pivots that transformed both a company and our daily lives. Can you identify which famous product underwent the most dramatic transformation from its original purpose?

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Play-Doh (originally created as a wallpaper cleaner before becoming a children's modeling compound)
Post-it Notes (originally developed as a specialized bookmark for choir hymnals)
WD-40 (originally formulated as a cleaning solution for optical lenses)
Bubble Wrap (originally designed as a textured wallpaper before becoming packaging material)