Can I polish the inside of my car?

Yes, there are an endless number of products from very many manufacturers for 'polishing' or dressing the interior of your car. These are a different type of polish than the abrasive polishes used for polishing paintwork. Interior polishes for glass, trim, dashboards etc, are typically cleaners and/or light coatings.

Glass polishes are very good, and polishes for dashboards and trim might be similar to a furniture polish you use in your house. Many even come with a nice smell.