I got really scared the first time I flushed the sytem after my first valve job, and thought oh-no! I missed something big, or that the block was cracked internally somewhere, but after a couple of flushes it was all good.
FYI: citra-safe or equivalent type of citrus solvent works amazingly well on any grease or petroleum based deposits, even hard black carbon deposits and most non-acrylic or non-epoxy adhesives, etc, without attacking seals too bad. Simple Green is a good one too, and being vegatable based they are not a hassle to handle, or danger to your health, enviromentally sound, etc. (they work good as hand and clothes cleaners too)
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