Remove the chewing gum as much as you can from the garment (on which it is stuck).
Now apply some Lanacane to the gum. Lanacane can be bought at the drug or grocery stores. It is a group of chemicals – Ethanol, Isobutane, Glycol and Acetate, all of them collectively speed up the release of the gum from the fabric or cloth.
Wait for 30 seconds
Using a blunt knife (one with a good edge), scrape off the gum.