I'm looking for effective transfection reagent for siRNA treatment of C6/36 cells. I've used DharmaFect and Lipofectamine2000, but it gave transient knock-down of the protein or ineffective knock-down.
When starting any transfection experiment, I recommend optimizing first with a GFP plasmid to check transfection efficiencies. Once you have optimized that, then you move onto siRNA. And most people recommend using a pool of 2 or 3 siRNA for optimal knockdown.