Actually when the snow melts you get water.
I doubt that thing will melt the ice under the snow anyways. It would probably take really long time to melt the ice with that and when you do that you effectively start blowing away the road too. Probably what is left after that thing has gone is slush. That of course freezes into ice and snow again but it is not slippery flat ice but something that is still kinda slippery but not dangerously so.