Pretreat the sticky spot with Lysol. It really works. A long time ago here is what I did when stickers stayed stuck to my children's clothes thru the washer and dryer. I would rub vegetable oil to the adhesive and let it soak in. The adhesive would rub off in an hour or less.
Air dry to check if all the oil is washed out.
If you buy the large jug of it, it's not a bad price, and there are really 101 uses for it, including taking stickers off of anything. I put it in a spray bottle and dilute it by almost half. Spray a bit on the sticker and let it soak in. Rub the sticker off, then put a bit of dish soap on the spot to get the bath oil off. Toss in the washer.