Remedies for preventing a cold

Cake • It's called the American dream because you have to be asleep to believe it.
What are your home remedies and concoctions for preventing colds? 
I personally take echinacea supplements (hopefully I'll be able to grow my own soon), and I take one of those for 5 consecutive days and then hold off for two. It's flu and cold season and I work retail - but by doing this, I have yet to get more than a minor sinus ache upon waking up in the morning (and that was only once ;) ). 
So what do you do? 

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