Friction and stickers,
- Lightly moisten the old sticker paper, LIGHTLY!
- Wait a bit then with clean dry hands tightly grab the cart between you fingers and thumb.
- Push agenst the old sticker and rub in one dirction, lift you thumb and put it back to where you started, repeat.
- Once you have rubbed all the paper off use another sticker to dab on the surface and then pull it away, do this in small bits, DONT PRESS DOWN, just let it lightly touch then old glue the pull it off.
The idea here is to pull the old glue off with the fresh sticker. Look at the cart. at an angle to see where you still have glue.
I've done this with many things and it works well, usally, but there has been things that don't work on. Better than using solvents, oils, or alcohols that will wipe off the ink or worse yet melt the plastic.