There is a product called "Sneaker White".
Which comes in a bottle similar to regular shoe polish.
I have used this often and the results are great.
It truely will return the white to your sneakers.
Just use caution with application not to get any on the inside lining of the shoe,
if colored.but you know those Mr Clean Magic Eraser things?
They work miracles for this,
trust me.I hope my answer will help you a lot to understand my wordings.
I have Jordan's that i have been collecting for years that i have not been able to wear in forever because the bottom has turn yellow and my number 4 and 5 retro Jordans bottom and mesh what used to be clear plastic is now yellow! i have tried many cleaners and nothing has worked and i cant wait to get off from work to RUN and by Mr. Clean Magic Eraser to see if this REALLY works??? does it??? can i really wear my Jordans again?????. Ooop's, i mean BUY "Mr clean"