We did and still do. We use Kirkland's F & C since it was cloth diaper recommended, too. (Also, it's available at Costco.) Although, we have switched to Tide's Free & Gentle for cloth diapers because it's a bit stronger and does a better job at cleaning.

If you use a free & clear detergent, do you also add borax (a softener) to increase the cleaning power? F&C is usually a bit weaker compared to regular detergent.