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Both rock salt and ice melt are naturally occurring salts. Rock salt is sodium chloride, which is the same as table salt. Ice melt products can be made from a combination of salts like magnesium chloride and calcium chloride or can be those salts alone.

Rock salt comes in large crystals, so it helps provide traction on icy surfaces, whereas ice melt products need to be mixed with sand to provide traction. Ice melt products work at lower temperatures than rock salt, so they might be a better choice if you have a harsh winter climate.

When temperatures drop far enough, even rock salt can’t melt the ice. The briny solution freezes before it develops, and the salt doesn’t work, which happens around 10 to 15 degrees Fahrenheit. Keep in mind that wind chill and other factors impact ice-melting progress. Some ice melters, like magnesium chloride, work at colder temperatures and work better for deep winter freezes.

Whether salt melts ice overnight will depend on how low the temperature drops. If temperatures stay around 30 degrees Fahrenheit, you can count on salt melting ice overnight. Otherwise, the lower temperatures get, the less effective the salt is in melting ice, and the more likely you’ll wake up with a slippery driveway the next day. 

You can use hot water to melt ice from your driveway, but there are some serious caveats. Very hot water can quickly melt ice and remove it, which is helpful if you’re very short on time and need a solution ASAP. However, it will only work across a small area, after which there’s a chance the water will freeze again. The sudden clash of temperatures is dangerous for fragile materials, notably windows and other glass, so you’ll want to keep the water away from your car.