Just a note as to using heat - if you do not do this on a regular basis you should be extremely careful.
My time as a firefighter (11.5 vol + 17.5 career) I have seen many cars destroyed by guys who knew what they were doing.
Sad to see but these included (separate fires in the garage) 65 fastback mustang - 68 427 vette, couple of jeep projects, 63 vette, 2 Chevelles, etc. Several fires involved more then one car, most were contained to the garage. 1 fire had 7-8 antiques - all destroyed.
The picture below is from a fire we had several years ago. Guy working on his car. Leaves to go get something.
His wife goes out to help him clean up - used gasoline to clean the tools IN THE KITCHEN.
Sometimes you need to lock that door between the house and the garage.