You can either add some table salt to the ice or you can go out and purchase the calcium chloride which is used commercially for icy roads and such, although the calcium chloride will work best.
heat makes ice melt faster because if you put an ice cube on a pan ,turn on the oven, turn it to 50 degrees f ,the ice will melt and if you turn the oven to 212 degrees f the water will start to boil.
The effect of salt (any soluble material will work) is to lower the freezing point of the water, making it melt faster at a given temperature (or melt at all, if the temperature is slightly below the...