Glass cleaning formulation

Claim 1

A stable glass cleaning fluid concentrate which, when diluted, does not attack rubber seals and surrounding paint while, in use, and is devoid of smearing and hazing of automobile windshields under night driving conditions, said concentrate consisting essentially of: (a) an anionic surface active agent selected from the group consisting of: (i) an anionic sulphated alkyl phenoxy polyethoxy ethanol; and (ii) an anionic di-sodium salt of the half ester of sulphosuccinic acid; (b) a fluorinated hydrocarbon surface active agent selected from the group consisting of: (i) an anionic fluorinated hydrocarbon surface active agent with the fluorinated hydrocarbon portion having a branched chain structure with aliphatic per-fluorocarbon groups at one end of the molecule; (ii) a non-ionic fluorinated hydrocarbon surface active agent with the fluorinated hydrocarbon portion exhibiting a branched structure and represented by the formula: R.sub.f (OCH.sub.2 CH.sub.2).sub.n OR.sub.f wherein R f is C 8 F 15 , C 10 F 19 or C 12 F 23 and n is 10-30; (iii) a non-ionic fluorinated hydrocarbon with a branched fluorinated hydrocarbon portion having the formula: R.sub.f (OCH.sub.2 CH.sub.2).sub.m OR wherein R is lower alkyl and m is 2-20; and (iv) an anionic fluorinated hydrocarbon surface active agent wherein the fluoronated hydrocarbon portion exhibits a straight chain structure and has aliphatic per-fluorocarbon groups at one end of the chain; (c) citric acid or sodium citrate (d) components (a), (b) and (c) blended together in an alcohol carrier wherein the proportion, in parts by weight, of (a) to (b) is in the ratio of 3.5:1 to 13.7:1 and the ratio, in parts by weight, of component (c) to the over-all blend is about 1:3.365, the cleaning fluid concentrate having a surface tension range of about 20-25 dynes/cm and a pH of about 3.0-4.0.