Like everyone else has mentioned the first choice is the hair dryer, however if it is a professional thing then you can buy a professional air gun and iron.
The airgun looks like a hair dryer but is smaller and a lot more powerful and the iron has a 2 inch sole plate which is brill for getting all those little bits off and if used with a cloth pad will remove the glue without chemical.
You can get both readily from model aircraft shops at a cost of about £20-£25 each.