What is best for flushing cocaine out of your system?

Being an ex-user of cocaine I can tell you first hand that it doesn't stay in your system very long at all after use on its own. Cocaine along with all other alkaloids (drugs that end in the -ine suffix) have a very short half life. Cocaine specifically has a 1 hour half life. Half-life is the time it takes for a substance, in this case being cocaine, to lose its pharmacologic, physiologic, or radiologic activity. Meaning that a small dose could possibly be undetectable in 2 hours. However, the more frequent you use it and the higher the dosage will determine how long it actually is in your system. I believe the longest I have heard of an alkaloid staying in your system for is roughly 4 days and that is from a drug that has a 36 hour half-life.