This kit can be used to clear off years of wiper haze from your windshield and save hundreds of dollars in replacement costs. Ideal for hard-to-find windshields on older cars. Try this test: Run your fingernail over the damaged area on your windshield. If nail doesn't catch this kit will work. If your nail does catch try the Deep Scratch Kit (40030). Mark the damaged area mix the special Glass Polishing Compound with water, attach polishing buff to your drill or low speed polisher (1,500 rpm), and start polishing! Includes: 1/4 adapter, 1 lb Glass Polishing Compound, 2 7/8in. x 1in. Thick Buffing Wheel.