Can't tell you how to remove it, however you want to replace it with clear acrylic (perspex is the trade name for one brand of acrylic/PMMA).
Any laser cutting place should be able to cut you one to size, you will just need to sand/file the corners.
If not concerned too much with originality, polycarbonate is another option which should last longer.


 
					
					 
				
				
				
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