Get a fresh, sharp blade by using the little score lines as a guide to break off the end. To do so, take that back cap off, slide the blade out the back end, and use the cap to snap off the end of the blade before putting it all back together again.
Maybe you've never even noticed it before, but that little arrow is secretly the most convenient feature on any car. It indicates which side of the car the gas cap is on. Believe me, it comes in handy when you're driving a rental car.
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Utility knife blades often have perforated blades that can be snapped off when the cutting edge gets too dull. They also have a little slot on the very back of the handle that you can slip the blade into to snap it off cleanly and easily.