when my gear starts to crystallize, i.e. test cyp or NPP, i boil some water in a saucepan and pour about 1.5 inches into a coffee cup. i then immerse the vial for a few minutes where it will liquefy perfectly. it then injects very easily.
dont know about baking...seems too risky that the vial would explode. but never tried it so dont you all jump all over me, goddamnit.