Yes alcohol will melt several types of plastic that I am aware of, ABS the common harmonica comb plastic is unaffected by alcohol. I remember using alcohol to clean vinyl records and the stylus to my turntable worked fine until one day the bottle tipped and spilled its contnents onto my cassette tape collection. It welded about 10 of the cases shut and fogged all of the plastic. The tape and the cassettes survived it just fine. fjm
