My adventure started when we headed to san antonio the jayco was in storage and while there a field rat found its way in.... and died.... upon searching for his entrance i discovered the previous owne...
Neither is cheap. I've used Git-Rot on boats before. It's 45 bucks a hit at West Marine and thats for a small amount.
Of course the OP had never stated what the RV make is, nor the year, nor the outer skin, only that it's 'aluminum framed'. I don't know of very many units that are aluminum framed in the first place.