The trick is get the insulation hot.
You can leave it outside in the sun.
You can put it on the oven.
The idea is the get it soft,once it soft, just use a sharp knife ,it come clean when you pull the insulation .
I saw it,on one of the scrapping videos on YouTube.
In that video they use one electric heater.
I f i ever find this video i will post a link here.
I hope it helps.
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