What can I do to preserve my soft top?

Twill or diamond vinyl like material? Twill or denim use 303 Fabric Guard, vinly like material 303 Protectant. I put the fabric guard on my vinyl and it did a great job of restoring some sheen and re-waterproofing it. I would likely try the protectant the next time around. That may be a bit more restorative to that material.

Uh, this material.

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Sail Cloth - Yeah that's what the call it. It's a denim/twill like fabric. If you've ever seen a premium JL soft top that's it.

Your top is that vinyl material I think they call diamond. That's what I have. I used 303 fabric guard and liked how it did. Slight sheen and re-waterproofed. The 303 protectant would be good and may even make it look a bit better, but won't waterproof it.
 
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Again - Another vote for 303 Aerospace Protectant. https://www.amazon.com/dp/B0185PU38A/?tag=wranglerorg-20 - My BestTop is 9 years old - Still looks and functions good. During the summer the top comes down - Living in Pittsburgh, It usually has to be raised a few times a week. Great results!

I also use Meguiar's PlastX Clear Polish. https://www.amazon.com/dp/B0000AY3SR/?tag=wranglerorg-20
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After 9 years the side and rear windows are still plenty clear. I have not found anything that keeps them as clean and clear. I uses it 3-4x/year
 
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