Best windscreen washer fluid

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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6414

  Z3 roadster 3.0i
Location: Johannesburg

Best windscreen washer fluid

Post by Southernboy » Mon 01 Oct, 2018 13:09

Having fitted a new soft top, I would like to know if anyone has considered which reservoir washer fluid to use. I'm certain some fluids could leave marks of residue in the fabric and others may just be plain harmful. Anyone ever found an effective cleaning fluid which they would recommend?
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Robert T
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Joined: Mon 12 Jun, 2006 11:35
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  Z3 roadster 1.9
Location: Cheshire

Re: Best windscreen washer fluid

Post by Robert T » Mon 01 Oct, 2018 19:39

BMWs own. I but a 5 litre bottle of concentrate and dilute as needed. Good for pretty much all climates. Lasts ages and doesn't seem to go "off" in the tank.

Cheers R.

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Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
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Southernboy
Joined: Thu 07 Oct, 2010 13:39
Posts: 6414

  Z3 roadster 3.0i
Location: Johannesburg

Re: Best windscreen washer fluid

Post by Southernboy » Mon 01 Oct, 2018 21:21

Thanks Robert. I'll go that route then.
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motco
Joined: Tue 18 Aug, 2009 19:12
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  Z3 roadster 2.2i

Re: Best windscreen washer fluid

Post by motco » Wed 03 Oct, 2018 09:38

I use the cheapest concentrate available (not 'ready-to-use') but always dilute it with demineralised water. I live in an area where tap water is hard and when it dries it leaves traces of hardness salts. You don't want that on your mohair! Because of the hard water, all water used in the kettle comes from a filter jug fastidiously maintained with a fresh filter when necessary. The routine when filter changing involves discarding the first two litres of water through a new filter to avoid any taste taint so I keep that for the screenwasher. Concentrates usually have two main components: a pH neutral detergent and isopropyl alcohol as an antifreeze. Dyes and perfumes are present too, but only, I suspect, to justify the price. There's probably an anti-fungal component too.

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