My experience has been that pyrethrum or anything in that family is the best spray or dip. By best I mean kills the most mites, but of course neem oil is the best in the "natural and safe" category.

pyrethrum is the best way...you just have to adhere to a strict regimen
Since you are not going natural anyway, wouldn't the "best way" be to spend 30 seconds 2 times instead of a "strict regimen" many times?

To me the best way to solve a problem is the way that properly fixes it in the shortest amount of time. I guess that's because other than my family and my health, my time is the most important thing that I have. I guess if you just like spending time with your weed project, go ahead and spray and dip. I already spend too much time with my weed project. I'll use a pest strip again if I ever get mites. I'm pretty sure that they are gone now for good. That's what pest strips will do for you. Praise (insert your main religious figure here)!

And now, fun with pocket microscopes:
Of course everyone has one of these. They're only $8 at radio shack. You really need one to look at trichomes. Thats how you know when to harvest. Well anyway, one day after administering the pest strip look at the mite eggs. You will see babys killed dead in their tracks as they attempt to emerge from the eggs. Ha ha, very funny. Take that you fuckin little bastards.