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Is it necessary to use deionised water in screenwash? My car manual doesn't say anything about it but I saw some reference online claimin tap water can block the system.
Unless your tap water is filled with soil and leaves?
Boiled then left to cool tap water
What does that do other than get all the air out?
It would kill bacteria but surely at the same time concentrate any contaminants as you'd be boiling off clean water leaving the crud behind, you need to be collecting & condensing the steam for this to make any sense, but even then it's pointless.
Just use tap water.
Shortly after I purchased my car, I noticed a disgustingly eggy smell when using the screen wash. I had to empty the tank and I pumped it through with boiled and cooled water.
I guess bacteria had gotten into the system. However, after using the blue Halfords premixed stuff, the smell has not returned.