If your looking to give yourself and everyone in your house a mild lung disorder then baking is probably the way to go
If your bored of the skin on your hands and have endless amounts of spare time to stand staring at a pot of boiling water for hours then boiling is the one!
Acetone isn't the nicest substance either but with a suitable container left in a safe place over night the tyres will fall off next day, easy! Just make sure you keep it somewhere the dog/kids won't drink it.
By the way does anyone know if tyres that have been through the acetone treatment are useable? Does it change the composition in terms of softness etc, they always have a milky white residue on them but feel ok in the hand!