.Help!Orange door panel resto

The dyes are laquer based so laquer thinner should take it off. We dont know for sure if a laquer based dye was used.
My similar experience.... 67 bucket seats have a steel back that is laminated with vynil. Previous owner sprayed with ??? who knows? I took them to a local paint store and they tryed thinners starting with weakest avail. Ragged all the paint off without hurting the vynil.