Windex original is America’s no. 1 glass cleaner. Trusted by generations for its famous streak-free shine, Windex original cleans and shines glass, mirrors, and more. Thanks to its patented ingredient, ammonia-d, Windex original glass cleaner starts working on dirt and grime even before you wipe. Claim based on data reported by Nielsen scan track in household glass cleaner category for 52 weeks ending 10/31/15, total us xaoc. Copyright 2015, the Nielsen company.