I have two sarongs which appear to have been treated with some shellac although was not brought to a true “ piano finish” to begin with.
One had some signs of water having been splashed on it, I got some denatured alcohol and have been just rubbing it.
The remaining shellac on the surface got , I think, slightly soluble again and covered the superficial water spots and are now no longer visible. I am happy the way it looks,
I have to say that although I probably understand the desire of having a shiny surface bringing it to a piano polish would probably not be practical
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