Use a roof rake to carefully remove excess snow from the roof of your house. Try to remove at least 3 to 4 feet of snow back from the roof line. A push broom can also be used. Be careful not to damage your roof and shingles.
Cut the legs off of a pair of pantyhose.
Fill the legs with sidewalk salt. Tie the legs to keep the salt in the legs. Rock salt should not be used for this method. It may damage your roof and siding.
Place the ladder against the building and climb up to reach the downspout. Be careful and work with a partner to hold the ladder for you. If you are unable to safely use a ladder you can use a garden rake to help place the homemade ice melter in the appropriate spot.
Lay the stuffed legs on top of the frozen downspout. The ice will slowly start to melt. The legs can also be placed on frozen gutters.
Remove the old pantyhose once the downspout is unfrozen.