From my knowledge...I don't think there is a way to get it off. I think it is a chemical reaction between the plastic and the glue...
I snapped my visor the first time putting it in. I seriously reccomend using JB Qwik Weld, followed up with a coating of hot glue on the inside. I'm assuming you were using the superglue to help it hold faster? I had the same issue with my Rubies bucket...it flexed too much for me to hot glue it in. I ended up using the JB and doing small spots at a time. First starting with the left brow, then right, then left cheek and right cheek. Took me about an hour total to get it fully glued in.