Burnt on Plastic/Fabric on Exhaust Can

I've done this a number of times over the years, generally with synthetic riding pants. I've removed with with oven cleaner. I like the idea of using a wood spatula to get off the excess stuff. I found that the oven cleaner on a warm exhaust pipe or muffler took it right off.
 
I think heat is definitely the answer either scrape it off with a wooden spatula when the pipes are hot - as that was how it was applied or use a hot air gun.
 
And one of these stops it happening again.
 
I've been told but have not tried to use a can of air or something that with freeze instantly from the spray. Because of thermal difference it should peel right off the metal. True or false don't know.
 
I've been told but have not tried to use a can of air or something that with freeze instantly from the spray. Because of thermal difference it should peel right off the metal. True or false don't know.

Thanks. I have got most of it off now but am left with a slight shading of residue from the plastic. I have some Blue Job ordered as that has had good reviews. I will post result when I use it.
 

I got rid of the TORS not long ago for a Viking exhaust... anything that touches it melts pretty quick. The good news is I just keep on riding and it burns it off eventually... lol