Put the cloth area having gum on it in boiling water.
Now scrape off the chewing gum using a toothbrush, knife or putty knife.
Scrub the fabric with the tools mentioned (toothbrush, etc.) while it is still in boiling hot water
Allow the garment to dry
Then repeat it as necessary
Kettle is also an option you can consider for chewing gum remover. For this, boil some water in a kettle. Place the garment having the stuck chewing gum directly on the mouth of the kettle. The steam hits the gum directly. Leave it for a minute so that the steam softens the chewing gum. Scrub it with a toothbrush to remove the gum.