4G, NO!!!!!!!! For several reasons beside the fact it is a safety hazard in and of itself. The only reason it removed the frost previously is that the fuel temp was above the freezing temp of water. There are better options, leave the aircraft in the sun until the frost melts. Or, if the air temp is warm enough a mop and some hot water. If the temp is not warm enough a mop and hot water followed up by spraying the areas treated with gylcol or moonshine. There is an old bush pilot trick, that is approved by the FAA, of polishing the frost with a length of hemp rope. But unless you know what you are doing, don't try it.
Richard