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How to remove chewing gum from leather 
Rub the gum with ice. 
Place a piece of ice in a sealable plastic bag to avoid any water damage caused by drips from the ice. Take a piece of ice and slowly rub all over the gum.
The coldness of the ice will harden the gum, making it easier to chip away later. If the leather item is small enough, place it in a plastic bag and then put it in the freezer for about an hour.