Freeze the pants in a plastic bag for 1 to 2 hours
Scrape off the hardened gum with a dull knife or spoon
Apply ice cubes to the gum until it hardens
Peel or chip away the gum carefully
Rub liquid laundry detergent into the residue
Wash the pants according to the care label
Use white vinegar on remaining gum residue
Blot with rubbing alcohol if needed
Repeat scraping and washing until the gum is gone