So I cut up the usable portions of the flannel sheet into 9x12" rectangles. I layered two and serged the edges and then big stitched them together.
That is one big honkin' needle. But you need a big needle to pull the doubled crochet cotton through the two layers of flannel. I stitched from corner to corner diagonally in both directions and then stitched straight across both horizontally and vertically.
I ended up with a stack of these cleaning pads that not only fit on my Sweeper, but can also be used as plain ole dust rags. Best of all, they are totally green and I used what I have on hand.