Timbeck2
Final Approach
Not a shill or a spokesperson for the company, I happened across it online. My 47 year old headliner which probably came from the factory as white had quite a bit of yellow discoloration from God only knows what and it looked bad. Rub and Restore (link below) sells a vinyl dye in several colors that fixed my problem. Of course I had to remove a lot of the trim and tape the hat rack to do it but I'm glad I did. This stuff is water based and really easy to use and very forgiving. If you spill it on your clothes, it washes out. If you spill it on your leather or vinyl upholstery, it washes off with a wet rag. I would advise covering cloth upholstery however because I don't know what it will do or how hard it would be to remove it. I didn't take any pictures but it looks like I have a brand new headliner in my plane. Watch the video which shows them restoring a leather chair but it is just as easy for vinyl. Of course it isn't STC'd, PMA'd or otherwise prevents flying into a busload of nuns en route to a penguin petting but it is good stuff.
https://www.rubnrestore.com/
https://www.rubnrestore.com/