Vinyl window yellowing, tips for polishing back?

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Quick question, I have a soft top with windows that need some help. They aren't torn or anything but are yellowed with age. Anybody have a good way of polishing them up? Seems everyone has a trick. Worst case I can have new ones sewn in, but I'd like to preserve what I have.

Any advice is appreciated!

 

[MarkM]

Best bet is to take them to a boat upholstery and replace them. You will not get the results you're looking for trying to save the old ones. I've tried and wasted a lot of time. How is the stitching for the zipper? The thread they used for the zipper was not adequately UV protected. Real problem with the soft doors.

Mark

 

[juanprado]

Meguiar's makes a product for this:

Search Results | Meguiar's

www.meguiars.com

 

[Ray70]

I 2nd the Meguiar's products, I have used them as well as 3M hand glaze to polish and maintain vinyl windows on old cars with plastic convertible top windows. If really bad you may need to start off with an aggressive product then work you way down to a fine polish to get out any swirls left from the initial polishing.