Anyone Else "Oil Flush" When Doing an OC?

I actually did this once; but I had ulterior motives! I forgot to replace the oil drain plug because I was being so ultra careful. And I didn't have any scratch for another quart... Sheesh. Once bitten twice shy, as they say.
 
My late father-in-law was big on waiting until nothing, and I mean nothing, was coming out the drain plug.
Wife tells a funny story about the first time she took her car to an oil change place after she moved out and was living on her own.
She took a book to read because in her mind it took two hours to change the oil, she never knew any different.
She goes into the waiting room, gets about three pages into the book, and they tell her that her car is done.
"Huh? What?" How can that be?"
 
In the case of an extremely slugged engine I might consider filling it all the way to the top of the valve cover with the solvent and letting it soak a day, then draining. Unless the problem is that extreme I’m happy to just drain the old oil and replace it.
 
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