Fair play with the car lad looks well. The best way to get rid of sound deadening hands down is using the dry ice pellets stuff seen a few people use it you just throw it down over the sound deadening for a few mins and it lifts itself more or less and absolutely no glue left behind. I'm not sure where to get it but I'm sure Google would sort ya out.
Edit. Found it there. http://dryice.ie/shop/dry-ice-pellets-10kg/