Well I have two solutions...no pun intended ;-)

1) Automobile windshield washer. Good to -25, cuts ice, and works. Best for
the light stuff. I like to heat it.

2) Isopropyl Alcohol, sprayed on to cut the ice then apply with a different
sprayer RV antifreeze bought at Home Depot. I hear one could mix these two
together 50/50 and get a pretty good third solution that cuts and prevents
refreeze in one application. I would heat this one carefully ;-)

3) Most importantly, be careful of refreeze. Hot water is not enough!!

Bill Snow, PE, CP, IA, ASEL