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If you rinse them with tap and let them dry in some places you will get mineralization that makes a white film inside. The same effect seen on some used tanks around the top.
So I use tap and occasionally clean them with vinegar.
Okay, that makes sense so I'm going to change my ways lol's. At least tap to rinse and tank or ro to store! I was just soaking in vinegar when the glass got cloudy!I used to rinse my Hana cuvettes with RODI then rinse with tank water before use. Then I threw them all out because they were never as accurate as the titration type tests, but I guess that's another thread.