Amazing stuff - great cleaning power, nice foamy spray that doesn't drip excessively and nice scent. Allegedly has water softeners in the concentrate too but can't really say I would know if it did or not.I buy the cheap blue stuff, and I add a bit of this:
Nextzett Kristall Klar Washer Fluid - 250 ml https://a.co/d/03rOnnrd
I have a stash of the Nextzett concentrate and IIRC 1 liter water bottle that I have been using for years to make my own fluid at home - probably have way too much of the Nextzett but I stocked up some years ago when it was on sale for like $8. Winter time I grab a 16 oz bottle of 91% isopropyl alcohol from CVS/Walgreens to get me to a good freeze point for our area and the one fill with the alcohol spiked fluid usually gets me through winter other than that just the Nextzett dose and filtered water from the fridge.
Now areas that get very cold and deal with a lot of salt spray probably just easier to switch to the cheap blue jugs for the season.