The best stuff we've found for vinyl is a product Armstrong makes. We have a cream colored floor at home that gets yellowed from chemicals brought in on shoes, and throw rugs as noted above, according to the flooring store. The Armstrong product is the only thing we found that will clean it. There's a stripper, a polish then a cleaner to keep the polish in place. If you stay after parts 2 and 3 the stripper is rarely needed. The stripper by the way is a hands and knees job. Home Depot or Lowes has it.
Enjoy your new Airstream....