Yes, Seventh Generation brand hand dishwashing liquid is what I've been using for years, as a "sticker-spreader" wetting agent.
Link to product website here:
http://www.seventhgeneration.com/Fre...lear/Dish-Soap
Works like a charm and is very cost-effective in comparison to products that are sold specifically to use as a wetting agent for crop spraying.
It can be used in place of Coco-Wet because it contains only biodegradable non-ionic surfactants, derived exclusively from vegetable sources, not petrochemicals.
I called the manufacturer several years ago to confirm this information.
Here's a link to locate where you can purchase it locally:
http://www.seventhgeneration.com/whe...tail-merchants