What little fuckers are bothering you, in particular?
Never actually used it, have heard it can be done.
neem oil diluted works well, wouldn't want to be using it more than a couple of weeks into flower though....
And i tend to use savona (liquid soap) on allotment plants...
Go very dilute and bear in mind that although that will do an excellent job of bursting the existing pests it isn't a repellent. You can add crushed garlic and chilli to make it more effective. Also, don't do it too far into flower.
Oh yeah, strain it if you've added crushed garlic and chilli or 1) you'll clog your sprayer and 2) you'll leave particles of nicely broken-down veg matter all over the plants which might get quite deep into the buds and rot with non-hilarious consequences.
this sounds pretty foolproof: http://www.vegetablegardener.com/item/7076/garlic-and-chile-insecticidal-soap-spray
Clever fuckers. I love ants, really love them.