2004 Subaru Legacy Owner's Manual - Page 453

2Maintenance and service freeze type windshield washer fluid. SUBARU Windshield Washer Fluid contains 58.5% methyl alcohol and 41.5% surfactant, by volume. Its freezing temperature varies according to how much it is diluted, as indicated below. Washer Fluid Concentration 30% 50% 100% Freezing Temperature 10.4°F (-12°C) -4°F (-20°C) -49°F (-45°C) Replacement of wiper blades Grease, wax, insects, or other materials on the windshield or the wiper blade results in jerky wiper operation and streaking on the glass. If you cannot remove the streaks after operating the windshield washer or if the wiper operation is jerky, clean the outer surface of the windshield (or rear window) and the wiper blades using a sponge or soft cloth with a neutral detergent or mild-abrasive cleaner. After cleaning, rinse the windshield and wiper blades with clean water. The windshield is clean if beads do not form when you rinse the windshield with water. Do not clean the wiper blades with gasoline or a solvent, such as paint thinner or benzene. This will cause deterioration of the wiper blades. If you cannot eliminate the streaking even after following this method, replace the wiper blades using the following procedures: 11-52