What are the fluids currently used on commercial aircraft that have an in-flight windshield washer system (not just a wiper)?
And if they exist, are there fluids more "ecological" that could have a good cleaning capacity, especially on salt?
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Some aircraft do have windshield washers as part of the windshield wiper system. The washer fluid used is usually some combination of isopropyl alcohol, methyl alcohol, ethylene glycol, or propylene glycol.
Two brand names are TKS and Kilfrost.
TKS is 85% Ethanediol(ethylene glycol), 5% Isopropanol(isopropyl alcohol), and 10% Distilled water.
Kilfrost is also ethylene glycol, isopropyl alcohol, and pure water
In the past some aircraft also used these same fluids for windshield anti-ice/de-ice systems.
I am not aware of any “ecological” substitutes.