- Plug your keywords into the AdWords Keyword tool. If any of the terms don't seem to fit your product, consider including them as negatives. As Andrew said, this may result in decreased traffic to your site, but it also could drive more targeted leads because you are filtering out the users whom you don't want before they get to your site.
- Also, try a Google search on your keywords. Say you sell clothing. A Google search for "clothing" brings up results for wedding dresses and vintage clothing. If these aren't the types of clothing you sell, add them as negative keywords. You don't need to search through all 51,000,000 results for clothing; just click through a few search result pages to make sure you have all the negative keywords you need.
More on going negative
Last month, I blogged about why negative keywords are so important. One of the things you have asked about since then is how to find good negative keywords. Here are a couple of suggestions from Eric J., an AdWords specialist: