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I always use kerosene to flush the oil on a really dirty engine and windshield washer fluid to clean the combustion chambers.
My grandmother had a 93 Tempo with 1000 miles on it ~10 years later I got the car. I knew the engine would be a mess from only going 2 miles to church and back. So I put a quart of kerosene in the oil so it was a bit overfilled. I drove it up the road about 5 miles keeping the rpms up then changed the oil. It was like sludge coming out. I had to change the oil 3 times that day using cheap oil to get it cleaned out good but when I was done inside the valve cover looked new again. I figured it probably wore the engine some but overall it was better off. That car was really unreliable since it sat for so long. I don't think I will ever deal with another 'driven by an old lady' car. They have way to many age related issues over time.
On the top end I usually just run a hose from a ported vacuum source to the washer fluid tank. I used to just twist a wire around the hose to restrict flow but using a clear hose and fish tank gang valve is much nicer so that is what I use now. I drive the car normal and run about a gallon of fluid through the engine like that over about 50-100 miles. On the few engines I have done that to that I have took apart they all had very clean pistons and heads. Doing that every 10-25k miles seems to be about all that is needed. I have never tried seafoam but I figure it does basically the same thing.
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