Rain Repellant on 737 windscreens
A long time ago, rain repellant was withdrawn from service in favour of coated windscreens. That's fine, except coated windscreens are just about useless in heavy rain when compared to a squirt of the old rain repellant.
Talked to someone recently who swears by a commercially available rain repellant for car windscreens called Rainex (five US dollars a bottle) which she wipes with a small piece of cloth on to the windscreen of her 737 before engine start when destination forecast is for heavy rain. Her experience is that it is very effective and has enabled landing in very heavy rain which would normally prevent a safe landing and even a diversion.
Any thoughts on the subject? Another colleague uses the same brand name rain repellant in his 737 and confirmed it makes a remarkable difference in visibility when landing in very heavy rain.