Hi,
Because you where in the RV when it happened, instead of finding it a week later when you went to see the RV, you caught it in plenty of time to dry it out and avoid stains. Some bleach or other cleaners will do the trick if nothing weaker will take it out. Start with a mild cleaner and work your way up to bleach.
Also remove the inside cover and look for the 9/16" bolts holding the inside plate to the outdoor unit. They should be tightened to only 50 inch pounds of pressure, that is only 4 foot pounds. So if you have a foot long ratchet, only 4 pounds of pressure to consider them 'tight'. More snug than actually tight. It is compressing a gasket on the roof and sealing the leaks.
You might need to re-tighten them in another month, when the gasket has settled a bit more.
Good luck,
Fred.