14. Mothballs
Expires in: 2–3 months when used, 2 years when left unopened.
Average Cost: $5–$6 per pack*
Unopened mothballs can last up to two years, while those in use typically dissolve within two to three months. Their effectiveness depends on temperature and humidity.
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After use, mothball fumes may cling to clothes. Air out and wash garments to remove odors before wearing them again.