Mix one part cat litter and two parts wood ash together in a bucket for melting ice on a concrete driveway.
Put on gloves. Take handfuls of the mixture out of the bucket and sprinkle a thin layer over the entire driveway.
Wait until the next day to check the ice. If you missed some areas, sprinkle a thin layer of mixture on the spots.
Mix two parts ammonium sulphate granules and one part cat litter together in a bucket.
Put on gloves. Grab handfuls of the fertilizer and cat litter mixture. Sprinkle the mixture over the ice on asphalt driveways when temperatures are -25 degrees Fahrenheit or warmer.
Wait for 24 hours before checking the icy driveway. If you missed any icy spots, apply a thin layer of the mixture to the spots.