For heavens sake don't use acetone (fingernail polish remover) or the non-acetone type. Stuff is meant to eat paint (polish) and top coats. It can also eat plastic. Ask me how I know. And don't use heat. Yikes is all I can say.
Goo Gone works great. Dab a little on with a cotton tip appliator, wait 1/2 an hour, rub away from amchine and other parts or in a circle. In other words don't spread the spot. Lift Off is great too.
This is the time to use what is best for the machine not easiest for you. We don't want to damage the machines (our girls).