Even after trying with a plastic card ( I used an old hotel key )
Goo Gone and cloth ( I used 2 cotton rounds )
Apply a little Goo Gone to cotton round and blot on sticker
You can see the sticker absorbed the solution
Wipe off. This luckily came right off! :) If it is a thicker goo you may have to use more and use the plastic card gently push the edges.
Clean with a little soap and water. Wipe dry. ( I used a damp soapy cloth instead of washing the whole vase. )