My son-in-law recently had a new windshield installed in his 18 Civic. When the technician installed the new windshield, he then switched to his sales side. He told my son-in-law that unless he had the technician install new wiper blades for $60, the old blades could scratch the new windshield and void the lifetime warranty. However, to soften the blow, a person can stop in at any Safelite location in six months and they will install a new pair of wiper blades for free.