I've been doing a lot of work recently to stop the leaks in the car and today I noticed that the water that's been getting into the cabin has got in to the cracks in the sound deadening and underneath it too 
I managed to chip some of it off with a plastic tool to avoid scratching the paint but it's not exactly doing the best job in the world. Do I need to use heat and a scraper on it and then get some anti-rust primer to seal it or is there another way?
There's also a load of adhesive on the floor from where the old sound deadening was put down (this is the stuff that's painted, so I assume was on the car at a very early stage!) and so I'd like to clean that up as best I can, to make sure I protect the floor in the best way possible.
All help gratefully received as ever.

I managed to chip some of it off with a plastic tool to avoid scratching the paint but it's not exactly doing the best job in the world. Do I need to use heat and a scraper on it and then get some anti-rust primer to seal it or is there another way?
There's also a load of adhesive on the floor from where the old sound deadening was put down (this is the stuff that's painted, so I assume was on the car at a very early stage!) and so I'd like to clean that up as best I can, to make sure I protect the floor in the best way possible.
All help gratefully received as ever.

, you pour a little on to get the tar down to about -50 deg c and it will crack.
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