Front end, control arms frozen... Heat gun?

Hey everyone, as the title states some of my front end is frozen solid because my town has cycles of snow, freeze, melt, freeze once more and back 'round again. I wasn't sure what a massive groaning thudding noise was a few weeks ago, dealership took a look and turned out the entire front end was frozen as was transfer case due to the weather cycles we get. Now I have the issue of my front suspension being blocked up with ice, particularly my lower+upper control arms, making some pretty gnarly knocking noises with no heat source (garage, etc) to remove the ice. Should I pick away at it with a hammer or chisel? Or can I feasibly use a heat gun and if I can at what temperature (to avoid melting any components, bushings, seals, etc, with poor aim.)? Forgive the questions as I am not incredibly mechanically inclined at this point.
Thanks in advance.