Can't get my exhaust tips off

I had this problem. I went to the gym 4 times a week, and 18 months later I managed to pull them off.


Seriously though, some of that WD40 penetration stuff will work well.
 
penetrant spray, heat, freeze spray, screw driver and hammer, poss sacrifice the bolts on the clamps if theyre really bad -eventually they'll let go
 
If possible, try getting a bar on the end of the spanner or another spanner on the end of it. Should give you abit more leverage.