Greg Nichols said:
What is your hardness meter reading?
Is your cartrage is correctly, easy to put in upside down.
What is your flow rate coming out of the other end.
How are you spraying the rinse onto the car.
What if you don't use soap what happens.
Cheers,
GREG
So I talked to my friend today and asked if my issues might be caused by me letting the soap dry on the surface before rinsing, and I asked him if I should then just make sure I rinse the soap off the panels as I go, and in the end do a final rinse, then dry and see what happens...
I'll check the filter and see if it is installed upside down though.
I don't have a TDS meter or a flowrate meter to see how fast it's coming out, but (and I know this might not really help), I only turn the nozzle from the off position about a turn and a half or two max, so water is flowing at maximum of half the rate it can, but possibly less using one filter inline with the hose.
Funny thing is when I go wash my friend's BMW at his place down the street, and his apartment complex is much nicer (and I think they have flow rate meters!), I actually wash the car with the exact same procedure as mine, but I'm doing it in the garage at night when it's 40-50 degrees, compared to 60-70 in shade at my place mid to later in the day before sundown.
I always tape my mirrors with frog tape before I do long commutes, and clean the mirrors only with ONR using the same water, but leaf blow dry the mirrors and whatever else of the car that the water drips on, and this leaves no spotting whatsoever, so I usually try and stick with ONR if I can as it poses the least issues since water isn't sitting there constantly, and when I do the presoak, it's only with store bought DI water in a sprayer.
That said though, I would still like to get this puzzling issue solved because sometimes my car gets too dirty for what I feel ONR is safe to use on, and want to do a conventional wash.
Back to the soap concern though... When I conventional wash, I use A LOT of Gold Class soap in the bucket as it'll increase lubricity a good amount, but I'm wondering it this is causing the spotting once dried? In addition to that, when I conventional wash, I do the initial spray down of the entire car, then as I go to each panel, I rerinse, TBM the panel, then move to the next panel and repeat until I'm done, then rinse the entire car. As a result, the earlier washed panels will have had enough time for the highly concentrated soap to dry, which is something I'm thinking could be my issue, or at least part of it?