Just to let everyone know Discount auto and Im sure other place have this spray call PB Blaster. It really works great you will be suprised how it melts the rust away. i did my excaust and the exhaust on my brothers mustang and it made life a lil easier. the link shows the can and what it can do
PB Blaster Link

 

yea i used at least a whole can on my exhaust hangers