Is the plastic interior of your classic damaged by, for example, scratches and would you like to 'bring it back to life'? We received a tip from a reader to never do that 'refurbishing' with 'silicone spray', but first to sand with wet sandpaper 1200 or 1500 and then redo with 1200 or 1500 'dry'. When everything is ready and properly cleaned, rub in with Carplan Black Trim Wax. You do have to search for it, but it is available in our country. The internet brings a solution ...
You sand out any “leather grain” that may be present ...