3 Ways to Remove a Sticker from Plastic - wikiHow Remove any gooey leftover adhesive with a wet wipe and table salt. Method 1 Using Oils for Removal 1 Soak the label in cooking oil. Submerge the plastic in a container of cooking oil for 12 to 24 hours. Canola, vegetable, and other oils will soak into the sticker and loosen the adhesive. This will make it easier to remove later.