I pressure washed the interior of my trailer with all wires exposed as well. I ended up using the original wiring, and now it is a couple years later, and everything is still fine. I did replace all of the electrical outlets, more because I wanted something new looking and not the tired old yellowing originals. I had no subfloor in my trailer at the time. Your floor will probably be fine--you just need to get it dried out ASAP. Get some fans to keep the air moving, and it should be fine in a day or two.