My 1988 Excella has the vinyl coated walls and like all vinyl it does become sticky over time. When I asked the same question several months ago, someone in the forum suggested a product called Westley's Bleach White, a product most commonly used to clean white sidewall tires on your car. It's low cost and worked great on my RV without a lot of work. You can buy it a just about all stores that sell any auto cleaning or maintenance products. Like any other product, test it on your RV in a small spot first.
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