Imagine the horror of cleaning your melodica with something that was too harsh and watching it melt in front of you! Put that thought behind me!
I have found that eucalyptus oil on cu-tips is great for cleaning adhesive or really sticky stuff off too. it does no damage at all but you need to follow up with the isopryl alcohol or some soap and water to clean the film of oil residue that remains after getting the sticky stuff off. Again, all applied with various swabs or cu-tips….