hi, i have an old plane I am cleaning up, the knob black and caked with black paint and it is harder that any paint I have worked with. I tried paint remover but I never had much luck with it. i tried scraping it but it is very hard. Any ideas on a better way to do this. I want to refinish the tote as well. This finish is so smooth and hard I thought it was plastic, its not. The company name is in the side of the tote I want to preserve that thanks