Organic friendly surfactant/wetting agent

I am relatively new to growing. I have heard people mention using liquid detergent as a wetting agent, but I need something that won't kill the microbes in an organic tea.

Can someone point me in the right direction. If there is a particular product/detergent that you use, let me know the name. I live in North America so I should have access to anything available in this market. The ratio you use per gallon or liter is also appreciated.

Thanks!

I found this for anyone who might be interested: http://www.plantlightinghydroponics.com/spray-grow-coco-wet-wetting-agent-gal-p-3238.html

It's what I'm going with.

I use Dr. Bronner's Castile Soap.

Many people have success using yucca extract as a wetting agent, organic aqueous silica is very good as well.

yucca extract works really well. i use harvest moon's yucca. its 10 bucks a bottle....