It's making me cringe. I'm a fanatic about keeping the rig clean. We picked it up just over a week ago from Fleetwood for repairs in Indiana and drove home three hours to MI. It's covered with road gr...
What about mobile truck washing company's? They might be a bit pricey and you would have to check with the storage facility first, but they can wash they unit as long as they can get within reach of it with their hoses. I would expect it to be rather expensive, but better than excessive deteriation of your rig or maybe simply worth the piece of mind.