Is there anything (safe) that removes that glue?
I used the word "safe" because I once stepped on one of them barefooted. It was next to the toilet and I went there in the dark during the night. Next thing I knew, that thing was stuck to my toes. I went outdoors and found that gasoline removed it from my toes. But I would not want to use gasoline on a pet or on most clothing or other objects, and it's far too easy to get into one of them traps by accident.