I'm blaming over PreSpraying on the damn hydroforce. I'm so tired of having no faith and consistency with those things.
Deionized water is a beautiful thing. I've been using it for over a year and nothing penetrates, carries and rinses like it. Water void of mineral is aggressive and starving for mineral. Washing my truck with it is nice too.
I know people like to rinse with soft water and add tri-sodium for rinse. My thought on that is, that's a lot of sodium especially if you hooked to really hard water with your softener which is an ion exchange (2 sodium ions exchanged for every calcium/magnesium ion) . Spray that on your windshield and see how it dries. Does that much sodium in your water really rinse? IDK I'm not a chemist.
I'm with Mike on the RE being the best rinse machine. I love teflon
glides on mine so I'm not as aggressive and can dry pass a ton too. I've never had better results and customers demand the RE on the next visit. However most of my jobs I try to use the 10" brushpro as a kinder approach unless trashed.
I'm prespraying a lot less product mix with DI. I'm spraying less onto the carpet. I'm going one or two rooms at a time prespray, scrub rinse, next. etc. etc. No more prespray the whole level of 5 rms all at once.
I'll post pictures of my latest project that Kemp Waterfall turned me onto to pre-spray that has me junking the hydroforce.