Hey man, gotta quick question for you, after you take the door panels off and the "sound deadining" sheet, there is a layer of "glue/putty" like substance, how did you get that off? Its like impossible for me for some reason, ive tried, gas, acetone, mineral spirits, etc...

And its weird because i tried using aircraft stripper on the sound deadening and it warped the metal... so i had to fix it...