Sorry to hear you ended up with some adhesive on your sweater. How frustrating! To remove Fixodent from clothing or fabric, it should be removed by normal washing or dry cleaning.
If you get Fixodent on an other type of surface, it can be removed with one of several products. Using a small amount of rubbing alcohol, cold cream, or mineral oil will remove the Fixodent. Take care not to get these products in the eyes when rinsing. Hope this helps!