Sellers sellnship and mousesurplus in orlando. I got one that was trashed too. they have some great stuff, but they arent always completely truthful in their descriptions. One of my 12 footers was trashed. I complained and got a refund. I have 2 of the lighted banners. They "imply" that they might work, and might not. I think the truth is NONE of them work. Neither of mine did. I had to buy a new powerpack and a new LED driver. I have almost $300 invested in just one of them alone. The other is still in the box. I havent decided what to do with it yet. the one in the box is much brighter. I wish I had gotten it first, and its more beautiful. If I had known I would have never bought either, but I'm glad I did, because the LED banners are SOOOOOOOO Beautiful. Theres nothing else I could get thats THAT georgous.
Try cleaning with lighter fluid on your banner. It removes the black stains like magic!