I'm In Deep DoDo

What BO Plenty said! When I picked up my first 5th wheel, the walk thru guy was not the best communicator. When I went to connect it the first time, there was nothing marker, I connected my water hose to what I thought was the city water connection. Well it looked exactly like the connection I had in my class C? It wasn't, and the same thing happened, overflow! Called the dealer, they said, dump the black tank, remove the cover from underneath, replace the insulation, and after the covers, front and back, were dry put them back on! Now since it was new, as far as I knew the bath was still virgin. If I were you I would wash down your covers when they are off with some clorox, as well as the underside of your rig. Perhaps using a pressure washer to spray the misture on the underside with everythin removed would be a good idea, but be careful not to damage anything with the pressure washer. Let everything dry completly, let your nose be your guide then reassemble. You should be good to go! Good luck!!