For my first customer order :) I made a men's hat out of straw in size 52. I'm very proud of it, as I didn't have a hat block and I blocked the hat using an old hat stretcher. In the end, I got rust spots or similar stains on the brim from needles. Unfortunately, I haven't found anything to remove the stains. Do you have any suggestions? Or can I dye the hat afterwards? It already has a finish. Thank you in advance for your answers.