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If you frequently rent cars, you know the drill. Before driving off, find every scratch, stain, dent and ding and mark it on the contract so the rental company can’t accuse you of causing the damage.

There were very few things we coveted in the '90s as much as a good scratch-and-sniff sticker. The wisest among us knew you had to be conservative with all that scratching to make the smells last, and ...