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Hi Bojan,
The frosted surface looks very fine and probably produced by vapour honing during molding.
You could experiment with VERY FINE sandpaper, on ANOTHER piece of plastic to compare, but with grits in the 1200/1600 to 3000 range, with the sandpaper taped or glued on to a glass sheet to help maintain flatness. Then apply some fine automotive cutting compound, polish, brasso perhaps onto a sheet of glass and rub the flat lens over that.
TRY ALL OF THE ABOVE ON A TEST PIECE OF CLEAR PERSPEX OR POLYCARBONATE FIRST. The lens is probably made form polycarbonate so that might be best to try with.
If the frosted lens surface is already super smooth, you could also forget any of the sandpapers and simply apply the polish and polish the lens against a flat sheet of glass.
Best
JA
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