Many posts about this, and many, many opinions.
Best stuff for rubber seals and anything rubber and vinyl, bar none, is 303 Aerospace Protectant.
Developed ONLY for rubber and vinyl. Best stuff around.
Cheapest and best place to buy it is on Amazon, by the gallon. Cheaper than buying 2 quart bottles elseware.
Steve & Cheryl + Zoey, and Ziggy, our furry kids.
2012 Forrest River Lexington 283ts
Toad, 2013 Subaru XV Crosstrek