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I wouldn't use too much alcohol or for too long because it will degrade your plastic, hoses, and rubbers, especially if it's of higher concentration (on the other hand, lower conc have more water).
As for getting the old fluid out, why do you even bother? You're pressure bleeding and it'll all be flushed out anyway. Plus, the reservoirs and lines on most cars are usually small enough that it probably takes longer to try to siphon out the old fluid in the reservoir rather than just taking a few extra seconds with the pressure bleeder.
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