Window cleaning with pure water

How many of you are cleaning windows with pure water? are you using a DI tank or RoDI cart?

We have relatively soft water so we do fine with DI tanks.
Using a water fed pole with a pure water setup is profitable on its own for cleaning low-rise windows but it’s also a very profitable add-on for residential and commercial power washing. It also negates the complaint about windows not being perfect after power washing.