Is it better to polish the nozzle with sandpaper or file, and the color is as high as the model?
If there are a lot of water stains left, first use a file to polish them, then use No.400 (or No.600) sandpaper to smooth them during quick polishing, and then use No.800, 1000, 1200, 1500, and 2000 sandpaper to smooth the ground in front in turn (the principle is similar)