I may try it on one of my cheap melodicas, the spray probably applied with a cloth. I don’t think it would do any harm. My question is whether an application would have a lasting effect. If it had to be applied frequently, it would be too much trouble (for me). I have two Suzuki Study-32s, one I’ve hardly played at all, one that has been played a lot and has reed corrosion. I think I’ll order some spray and experiment with them. I think there are petroleum based and non-petroleum based anti-corrosives, so I’ll have to look into that.