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Having said that I wonder how that sits with the screen wash related legionaries problem
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I don't know, it's only second time in my life I have heard about it , had to google it first time to see what it is and don't know about anybody affected buy it so I don't think it is such a big problem. I would think chemicals in screenwash would kill it anyway, winter screenwash has a lot of some kind of alchocol in it to stop it from freezing, it's either ethanol, methanol or isapropanol. As for the summer screenwash I don't know but I would guess that if it does not kill legionaries as is and if it was such a big issue they would add something specifically to kill legionaries. That would only leave people who just use plain water vulnerable. Besides that it gets hot under bonnet anyway especially in summer and on long drive so washer fluid would get pretty warm anyway.
It's probably temp controlled on merc either by electric valve or thermostat to work only in winter as it did not seem to heat up screenwash at current conditions.
Some of american cars use electric heaters for screenwash as factory option and you can get aftermarket replacement or upgrade kits. They do not heat the whole bottle but small in-line compartment.
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