Short of standing the car on end and shaking it a couple of times, you are not going to get all the coolant out. The best you are going to get doing a gravity drain is around 80-85% of the system's capacity. Refilling the car with distilled water, then running it for a bit before draining will help get rid of any remaining old coolant.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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