craftgrrl | Cleaning white craft show tent?

I just got a used 10x10 white tent with four walls for an event I'm doing next week. The whole thing was pretty dingy from use on the craft circuit. I scrubbed the walls with Magic Eraser and that seemed to eliminate a majority of the scuffs and dirt. We've tried cleaning the top with a bleach solution in the washer, but it's still dingy. There are some dirt and rust stains that are particularly tough.

The other problem that we have with cleaning is not having a large enough (clean) surface to spread it out. The house is too small and the lawn/driveway just add more dirt. *sigh*

Any advice on cleaning white vinyl surfaces? I'm looking for tried and true product and cleaning method suggestions.

Thanks!