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I discussed polishing it with Chris Howard (Cyclo Retro) but he said removing the paint would leave the alloy unsuitable for polishing (slightly less shiny and finish is uneven in colour and surface) and claimed it is "not worth doing to 105". My bike originally came with RX100 which was basically 105 but with bare metal with a transparent finish. These parts indeed still keep the bike of a friend running.
I agree, the 1055 is incredible value for the money. I found that polishing helps to make it prettier: