Stripped out the interior of my mk2 and found...

...Rust and tar!!
Could someone give me some advice on what I should do to fix this rust just under where the steering wheel column comes through the firewall...
... And also what to do with these tar mats, should I leave them in? The metal underneath the car seems to be solid, but do they attract rust?
I've also got some rust coming through where the heater was due to a build up of leaves, what's the best way of getting the grill off the top so I can clean that crap out?
Thanks!
Keith
*Edit, the images aren't showing up for me.. any suggestions?
I Edited, they are now-RM
Could someone give me some advice on what I should do to fix this rust just under where the steering wheel column comes through the firewall...

... And also what to do with these tar mats, should I leave them in? The metal underneath the car seems to be solid, but do they attract rust?

I've also got some rust coming through where the heater was due to a build up of leaves, what's the best way of getting the grill off the top so I can clean that crap out?

Thanks!
Keith
*Edit, the images aren't showing up for me.. any suggestions?
I Edited, they are now-RM