If, like me, you have glue marks on your bison upholstery, try using a towel and Halford's Rain Repellent stuff. If you work it into the dried-on glue marks, it peels them off very nicely, and with no damage to the bison, as long as you don't scrub too hard. It works!!
I was puting the stuff on the windows and mirrors, and I just sort of, well, used it on the glue marks. Trial and error, or the mark of a true genius and lateral thinker? You decide.....
