can you put washing up liquid in car screen wash

[Olga]

No, you should never put washing-up liquid in your car's screen wash reservoir. While it might seem like a cheap alternative to proper washer fluid, dish soap is formulated for cutting through grease on plates, not for automotive use. It can damage your vehicle's washing system, impair visibility, and potentially harm the car's paint.

The primary issue is the chemical composition. Washing-up liquid contains surfactants and degreasers that are too harsh for automotive components. It can degrade the rubber seals and hoses in the washer fluid system, leading to leaks. Furthermore, it creates excessive suds that can clog the washer jets and leave a streaky, sticky residue on your windshield, severely reducing visibility in sun or glare.

For your car's paint and clear coat, dish soap is equally problematic. Its high pH and degreasing agents can strip away protective waxes and sealants, making the paint dull and vulnerable to environmental contaminants. In freezing temperatures, washing-up liquid offers no protection and can freeze solid in the reservoir and lines, potentially causing expensive damage.

Always use a dedicated automotive windshield washer fluid. These solutions are specifically engineered to clean effectively without suds, contain antifreeze agents for winter, include lubricants for the pump, and help prevent the growth of algae and bacteria in the tank. It's a small investment that protects critical safety systems and your car's exterior.

Feature	Washing-Up Liquid	Proper Washer Fluid
Chemical pH	Often high (alkaline)	Neutral or balanced
Suds Level	Very high, persistent	Low or anti-sudsing
Freezing Point	Freezes easily (32°F/0°C)	As low as -27°F/-33°C
Effect on Paint	Can strip wax, damage clear coat	Safe for automotive finishes
Effect on System	Degrades rubber seals, clogs jets	Lubricates pump, protects components
Cleaning Ability	Leaves sticky film, streaks	Cleans without residue

[AidenLynn]

Trust me, don't do it. I learned the hard way. My windshield was a smeary mess for weeks, and I had to replace the little nozzles because they got clogged with gunk. The proper stuff is only a few bucks at the gas station. It’s not worth the headache trying to save a few cents with dish soap. Just grab the blue bottle.

[LaJulia]

From a chemical standpoint, the formulations are completely different. Automotive washer fluid is a balanced, pH-neutral solvent. Washing-up liquid is a high-pH detergent with surfactants designed to cling to grease. These surfactants will foam excessively in your car's system and leave a film on the glass that actually attracts more dirt and dust, making your visibility worse than before you cleaned it.

[SerenityDella]

Think about it like this: you wouldn't use engine oil in your power steering, right? They're both fluids, but for completely different jobs. Your windshield washer system is designed for a specific type of fluid. Using the wrong one can lead to a costly repair for the pump or fluid lines, which is a huge bill compared to the price of the correct fluid.

[ErinAnn]

Beyond just a streaky windshield, it's a safety issue. In cold weather, dish soap will freeze and block the entire system right when you need it most to clear road salt and grime. Proper washer fluid has antifreeze. Also, the soap's residue can be dangerously blinding when driving into direct sunlight. For the sake of safety and protecting your car's components, always use the product made for the job.