There is a special place in my heart for the clerk at our local kitchen specialty shop who gave me, yes GAVE me this little black scraper tool for removing stubborn stickers from things. I asked her if I could buy one when I saw her using it to remove a sticker before wrapping a gift for me and she said to her knowledge you couldn’t buy these handy little tools, but they had plenty since they came along free with some product they ordered for their business. (Presumably those dratted price stickers they put on everything that you can’t remove without this handy tool!)
Sometimes, well okay, ALWAYS after you have used the handy scraper to remove all the paper from the sticker there is glue residue left behind. That’s where the peanut butter comes in. If the item is not going to be used in the kitchen, I use Goo Gone or some other solvent product, but for food prep or serving items, I don’t want to use solvents. They are not welcome in my kitchen. So a little peanut butter on a paper towel works like a charm. Rub that glue residue and watch it dissolve and disappear. Yes, you now have a greasy smear of peanut butter on your glass (in this case), but a clean paper towel easily gets most of that off and a trip through the dishwasher finishes the job. You will never know there was a stubborn sticker there.
Before I learned this trick I had some cups that retained a gummy residue in perpetuity, no matter how long I soaked them in sudsy water or how many times I sent them through the dishwasher.