I have a Samsung FL. I don't make my own detergent but I have used dawn in my washer numerous times without a problem. The thing with FL'ers is you don't want a ton of suds because it can sort of 'overflow' into the bearings of the machine. So try it out but start with a small amount of detergent to see how it suds. I've used ecos and it works great but I also add calgon because we have hard water and ecos+hard water= stinky clothes/diapers. I've actually been using the Mexican deterget called Ariel on our clothes and it works great....verrrry similar to Tide powder and less than half the price, plus its not as scented imo.
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JoDe, cloth diapering addict and mommy to Reese 1-11-07, Tanner 11-13-10, and Ralli 10-11-12