It seems that this particular thread has run many months, yet in this thread I don't see any specific mention that as I understand it, AIVS products underwent a complete "overhaul" of its products, and any previously noted issues have been totally corrected.
I now myself use the AIVS products by a very high recommendation-endorsment from one of our own members here.
Although the four step process is a procedure that perhaps some may not wish to undertake, I myself see it as a minor inconvenience knowing that my LPs cannot be gotten any cleaner, and left with no remaining residues, period.
After the multitudes of $1,000's of dollars spent on my Cartridges, Turntables, Cables, Pre-Amps, etc, etc, my take is that these extra steps insure that these components can take the best advantage of what pristine clean records can offer. The addition of a couple of extra cleaning-rinsing steps I see as plus, versus a one, or two step.
Apparently AIVS has gotten it's act together big time, resolved all past discrepancies-issues and the four step process I use makes perfectly logical sense. I am very satsfied with the results I am now getting from using them.
All no doubt will agree, a one step process cannot properly do everything that is required of it.