Hmm...I most likely have the same ceiling as you do, and no black stains at the seams...the rig had a stain on the side of the forward air conditioner housing from a leak (it looked like), but regular automotive upholstery cleaner removed it, and it doesn't leak there now.
Not sure what's happening to you, but doesn't sound right.
__________________
2005 Bounder 34F Class A - 2013 Honda CRV Toad
|