A roll of plastic wrap
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How To Remove Stubborn Price Tag Stickers Using Plastic Wrap
Rubbing alcohol, WD-40, or olive oil can be a hit or miss when it comes to removing price tag stickers. If you want a foolproof way, use plastic wrap along with these lubricants.
Put oil on the sticker and a paper towel, put the paper towel on the sticker, then wrap it in plastic wrap and tape the edges. Let it sit for a few minutes and peel the tag off.
The towel provides consistent moisture, the plastic wrap and the tape create an airtight seal to lock the moisture in, and the oil, not being able to evaporate, dissolves the glue.