to 'remove' ionic bonds, you will need energy to overcome them. and the first notion that jumps to mind is, heat.
you could also insert another ionic species that will disrupt the ionic bonds by breaking the weaker bonds and forming stronger bonds between different cations/anions. sometimes it need heat, sometimes it doesn't (dissolution of ammonium salt, an endothermic process, occurs spontaneously due to the increase in entropy of breaking up a crystal).