The safest way is to soften the adhesive before you try to lift it. Start by testing a hidden spot, especially on painted metal, composite, or wood. Use a warm, damp cloth with a little mild dish soap and let it sit for a few minutes. For metal or glass, a hairdryer on low can loosen the glue, but keep it moving and don’t overheat plastic or painted surfaces.
Once the residue is soft, lift it with a plastic scraper, an old credit card, or a silicone spatula. Work at a shallow angle and let the tool do the work; don’t dig or use a metal blade, knife, steel wool, or an abrasive pad. Those can leave scratches that are permanent.
If glue remains, try a small amount of cooking oil or mineral oil on a microfiber cloth. Let it sit for a minute or two, then rub gently in circles. Oil is good for metal and many plastics, but test it first on wood or composite because it can darken the surface. For glass, powder-coated metal, and other non-porous surfaces, isopropyl alcohol on a cloth can cut adhesive; don’t pour it on and don’t let it pool.
After the sticker is gone, wash the area with soapy water to remove oily residue, then rinse and dry. This matters on public furniture because leftover oil can attract dirt or make the surface slippery. Avoid acetone, paint thinner, harsh solvent cleaners, and high-pressure washing unless the furniture’s manufacturer says otherwise. If the piece is public property and the residue won’t budge with gentle methods, report it rather than risking damage. Patience and plastic tools are the key: soften, lift, clean, and dry.