IMHO...I think that if the test is performed with Kreen.....the results will be outstanding!
I've seen what has come out of my engine, that I thought was spotless with good maintenance. After two doses of Kreen and judging from the color of the oil changed and filters changed,as I documented in the Kreen thread, there is no doubt in my mind that the cleaning done by Kreen was outstanding.
Without looking at the engine with the valve covers off, I can only surmise that the first dose did the actual cleaning and the second dose any additional cleaning and varnish removal.
I also have a Toyota engine....around the same period as Artem's, and I bet he will be spotless if he runs Kreen for 1K or more.
If I'm wrong.....then I've put my foot in my mouth. I can only express and post what I've seen come out of the sump on my 1997 T4R and collected in the removed oil filters. My vehicle has lived it's life mostly on Dino and Dino/Synthetic blends and not full synthetic or boutique oils.