How do you remove self adhesive signs from glass?

you cant; they are fixed in place

Try using ZIPPO lighter fluid. A little on a paper towel or rag will take off any sticky residue. Just remember this stuff is flammable. Just about any organic solvent will remove adhesive. Organic...

Use Goo Gone according to directions.

I would try steaming them. >Answer. Try using dishwasher liquid diluted in hot water.  Score (make lines with a sharp knife just through the top layer) the paper, then thoroughly wet...

I use a product called "Goo-Gone". It's an oily orange substance that smells of petroleum. (I'm in the United States.) I've found that very non-polar solvents like oils (Goo-Gone, gasoline, mineral...