Windshield washer fluid added to coolant

[Unobtanium]

Tap water is fine unless your tap water comes from a well.
Also agree that not even a little bit of washer fluid would hurt. It is mostly water. You should keep a jug of the premixed stuff handy but you shouldn't need to top it off much unless there's a problem.

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It also depends on where you live. When I lived in S TX, every faucet in the house after a few years if you didn't use chemicals on it, looked like the bottom of a ship. I have replaced more water pumps than I can recall on vehicles, and I'm only 31. Color me paranoid. I ever began looking at the content of various coolants and researched that to death, too. I fear for those wee little seals that weep and necessitate expensive and annoying repairs.

 

[murky]

If it was just put in the radiator overflow tank, and the vehicle was not started, I'd remove the tank, pour out the fluid, rinse it out, reinstall it and fill it with Mazda coolant. In most cars the tank pull straight up, after removing a bolt or moving aside a catch.

Its just a bottle with a flexible tube/straw in it. If the engine was cool, nothing will have left the tank, it just needs to be cleaned out.

 

[Dimcorner]

Well at least this answers the question of washer fluid instead of oil fill.

http://jalopnik.com/heres-the-disgusting-mess-that-happens-if-you-fill-your-1796673220

 

[craigo]

Washer fluid may have other ingredients like surfactants (detergent) and additives that could cause havoc in the tiny channel environment of engine cooling. Flush the system - better safe than sorry.