Arlie, I have parchment interior (basically light tan seat belts). When I got the box of parts with the car, the rear belts were in the box and were almost black from dirt, grease. I took some "Greased Lightning" cleaner I bought at Sams Club and scrubed the belts with a strong scrub brush (being careful around the FOMOCO tag), dipped them in water, scrubbed some more, and then hung them up to dry. It really worked, and they look almost new. NOT concourse, but local show quality. .....worked for me.....Casey