Detailing - cleaning vinyl seats??

ok my seats are a lil old and the white is starting to look bad i tried everything to clean and make the color more vibrant. so someone suggested white shoe polish and not to get it on the green of the seats. Do u guys think this will work?

there is vinyl care products for cars at walmart use that.

i tried all that stuff, meguiars spray 9 all that stuff but it never works i even go to a friend that works in a detailing shop that gets all the good stuff but nothin works. but i was thinking shoe polish because its for vinyl to and i am hoping it dyes it almost

nothing where is auto geek........