Try 303 Aerospace Protectant.
303® Aerospace Protectant™ for long-lasting finish and shine
I have used this for 20 years and it can't be beat. As an upholsterer, we see lots of issues. Most vinyls in automotive use are very good, now. 303 adds a level of protection, especially against weather related issues. You can find it at Amazon, too.
DO NOT USE AMORALL!!!!!!!!!!!!!!!!!!!!!!!!!!
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