Prestone screenwash is very good and no algae build up at all.
It leaves a smearfree finish and I now use it for general house window cleaning.
I mix it 9:1 with water in a spray bottle, wipe it over the window with an old tea towel and buff with a dry tea towel. - it beats all the proprietary window cleaners I have used over the years including newspaper and vinegar.
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2001 V40 2.0lt Sport lux - Daily Driver. 174k miles.
2003 C70 2.4 GT Convertible - Garage Queen. 65k miles.
http://www.neptuno6benagil.com
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