this morning about 4:30 I started salting there was about a 1/2 inch of ice and the freezing rain was still coming down . at about 7:00 I went to check on a couple lots that we already salted and they were froze over again like I was't even there before. I thought the salt would melt the ice that was already down and prevent any more rain from freezing GUESS I WAS WRONG . I ended up plowing the lots and resalting when storm was finished . should I charge for first salting? if it's my fault it did not work , I would not be comfortable charging for my mistake. what would work next time there is an ice storm???