Cleaning a bow front

I just razor bladed my mantis tank, but my reef tank is a 46 bowfront and ive already put 2 scratches in it trying to clean it. Any suggestions?:Cheers:
 
I just buy the single razor blades from hobby lobby and do it by hand, its kinda a pain but i think it works well. Although, looking at my tank right now, its long over due on my tank as well.
 
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