I've never had fusible web on the top of my project before, but once I had issues with Pellon 805 not bonding properly because the client was decades off on dating her heirloom fabric & it turned out to be cotton/poly blend, which doesn't work well with 805. I contacted Pellon's help line & the lady suggested washing it multiple times in cold water & drying it. That dries out the glue so it isn't sticky anymore. But I don't know whether there was any visible residue left because it was on the wrong side of my fabric. Still, it might be worth a try.