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Use a sandpaper
https://opticalresourcedotcom.wordpress.com/wp-content/uploads/2011/11/poly-safe-ar-stripper-8oz.pdf
It looks like they all use HF or ABF. Super dangerous if it gets on your skin or in your lungs.
https://emergency.cdc.gov/agent/hydrofluoricacid/basics/facts.asp
Some tire and wheel cleaners are HF based, I'd try that.
Oh well good thing it's not breaking off into a powdery substance near my nose and mouth
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