How do I COMPLETELY remove pink milkshake from my engine block??

I had a radiator in my 2005 Sequoia Limited blow out internally, allowing my transmission and coolant to mix. Fortunately, I’ve seen no evidence of pink milkshake in my transmission, and I’ve flushed 14 quarts of new fluid through it. I’m keeping my fingers crossed that coolant didn’t pass back that way. Time will tell….

However, I definitely have the pink milkshake in my engine block. After replacing the radiator, I’ve drained the system, refilled with water, ran it, disconnected lines and blown air through them, time and time again. At this point it seems that the tranny fluid is mostly out. The water I’m putting in is coming out as water, BUT there is always a pink film on top of the water I recapture. And when I look in the small hoses to blow air through them, there sits the greasy pink stuff.

My question: is there anything I can add to the coolant system to get rid of the final traces of transmission fluid? Before refilling with coolant, I’d like it to be all gone.