Summarize this article in one sentence.
Look around the edges and corners of the contact paper for any parts that may have lifted up slightly. Grasp the edge or corner and slowly tug the contact paper upward to start peeling it from the glass. Don't worry if the contact paper breaks or if it's stuck in some areas and just focus on getting rid of what you can. It's best not to use heat to remove contact paper from windows and other glass surfaces. This is because if there is a large temperature difference, the glass could break. Attach a single-edge razor blade to a scraper and gently scrape around the edges of the remaining contact paper. When there is enough of the contact paper lifted to hold, use your fingernails to peel the contact paper away from the glass. You can find single-edge razor blades at home improvement and paint stores. Wear gloves and pour some adhesive remover onto a cleaning sponge. Rub the adhesive remover over the sticky residue and wait for 2-3 minutes to let it start working. Then use a clean cloth or the scraper again to easily wipe or scrape away the sticky residue. Choose an adhesive remover that's designed for non-absorbent surfaces like glass. It's likely that the glass won't be looking its best after the contact paper! Get a microfiber cloth and dampen it very lightly with warm water. Wipe the glass with the cloth and then use a dry cloth to remove any excess water. Alternatively, you can use paper towels.

Summary:
Peel off as much contact paper with your fingernails as possible. Use a single-edge razor blade to remove the rest of the contact paper. Use adhesive remover to remove the residue from the glass. Clean the glass with a damp microfiber cloth to make it clear and shiny.