I got this in an antique shop hoping that I could make it look better and then replace the knot. It is made of a rubber feeling material and unfortunately has a dull whitish look over the handle. I had hoped that I could clean that off and make the black shinier than it looks now. I washed it with soap and water with no improvement, then tried isopropyl alcohol and it was no better, no worse afterwards. Does anyone know if I’m out of luck improving it or if there’s a good solution? Thanks for any advice or information.