I would advise against using those. Here's why- if the finish is polyester, they will make it look cloudy or streaked. But it won't damage the polyester. If the finish is lacquer, they might. I am guessing the finish is high gloss, so I would recommend using Cory High Gloss polish, or any Meguiars Plastic products which are anti static.
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Paul McCloud, RPT
Accutone Piano Service
www.AccutonePianoService.compavadasa@gmail.com------------------------------