That photo is from Rosanna Pansino... http://rosannapansino.com/blog/recipes/undertale-butterscotch-cinnamon-pie/
I think she's asking about using the dishwasher in stead of the pressure cooker - as it too heats the cans - not in stead of nail polish remover.I wonder if oven would do the trick... I assume it's some sort of plastic covering over the print to protect hands from staining, that is being removed with the steam.
I would like to know what kind of nail polish remover you used. Some are milder than others, and I can imagine you need acetone or other such.