To make a real change you need a professional "sand paper" with cerium oxide plus an orbi polisher, lots of water and patience. I have tried once to recover a hardened glass table with multiple scratches... the key is not to overheat it... or it does a shit-your-pants explosion leaving you with beautiful array of scatters to play with... or to use them in your kaleidoscope...
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"If everything seems under control, you're not going fast enough.” Mario Andretti
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