^^^ Good point.
On this one, after the 4th flush, the one with the auto dishwasher detergent, it is starting to clean up pretty decent, from views into the head and block via the t-stat and water pump openings. I did notice that the runoff from the auto DW flush ate at my drain pan where there was rust spots from old nicks and formed some whitish looking deposits; so I guess I had better make sure to get all of that out. One more commerical flush and then a fresh water flush today.
I reverse flushed and forward flushed the heater core several times and got a lot out of there. So, thanks to 71Scamepr for that thought. Rad is pretty clean after a long reverse flush and a lot of tapping all over to loosen a lot of little bits of deposits.
