I have searched quite a bit, and while I see several threads suggesting dish soap as a degreaser during a coolant flush, I cannot find one that suggests how MUCH to use. Any thoughts? I have already flushed my system of all (or most, anyway) coolant and am running water now, FWIW.

Apologies in advance if I have glossed over said information during my search!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)